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Knowledge base Updated: February 5, 2026

What is AWS (Amazon Web Services) and How to Safely Start Working in Amazon's Cloud?

Starting your AWS journey? Congratulations! But remember: in the cloud, security is your responsibility from the first click. This guide is your roadmap. Step by step, we'll walk you through the process of a secure start, from protecting the root account to configuring the network, to avoid common pitfalls.

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Entering the world of Amazon Web Services (AWS) cloud computing is like receiving keys to the largest and most advanced data center in the world. Within minutes, with a few clicks, you gain access to virtually unlimited computing power, global infrastructure, and hundreds of innovative services that a decade ago were reserved for technology giants. This power and flexibility open unprecedented opportunities for companies and developers. However, with great power comes great responsibility.

The public cloud is an environment where security is a shared responsibility. Amazon secures the foundations, but you are the architect and guardian of what you build on them. The first steps in AWS, taken in haste and without awareness of basic security principles, are the most common cause of costly data leaks and astronomical bills. This guide was created to help you avoid these pitfalls. It’s a practical, step-by-step instruction that will walk you through the process of a secure start, showing how to implement fundamental security measures from the very beginning and build solid foundations for your future infrastructure in Amazon’s cloud.

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What is AWS (Amazon Web Services)?

Amazon Web Services (AWS) is the most comprehensive and widely used cloud computing platform in the world, offering a very wide range of fully functional services from globally located data centers. In simplest terms, AWS is a gigantic, global server room that you can rent on-demand over the internet. Instead of buying, installing, and maintaining your own physical servers and infrastructure, you can “rent” a virtual server, database, or disk space in seconds, paying only for the resources you actually use, similar to electricity. This model, known as cloud computing, revolutionized the IT industry, drastically lowering the barrier to entry for innovation and giving companies unprecedented flexibility and scalability.

What are the main AWS services that every beginner should know?

The AWS ecosystem is huge, but at the beginning, it’s enough to understand a few fundamental “building blocks” from which most architectures are built. Amazon EC2 (Elastic Compute Cloud) is a service providing scalable computing power – in practice, these are virtual servers (called “instances”) on which you can run almost any operating system and application. Amazon S3 (Simple Storage Service) is virtually infinite, extremely durable and scalable object storage, ideal for storing files, images, or backups. Amazon VPC (Virtual Private Cloud) allows you to create your own, logically isolated from the rest of the cloud, private virtual network where you can run your resources with full control over IP addressing and routing. Finally, AWS IAM (Identity and Access Management) is the central service for managing identities and permissions that controls who and what has access to your AWS resources.

How to create an AWS account and use the free trial period?

The account creation process is simple and takes a few minutes. Just go to aws.amazon.com, provide your email address and basic contact information. You’ll also need to provide credit card details – this is a standard verification procedure; you won’t be charged as long as you don’t exceed AWS Free Tier limits. AWS Free Tier is a program that allows free use of a limited pool of resources for the first 12 months (and for some services, permanently), such as 750 hours per month for a small EC2 instance or 5 GB in S3. This is an excellent way to learn and experiment, but it’s crucial to set up budget alerts to avoid an unexpected bill if you exceed free limits.

Why should security be a priority from day one in AWS?

The moment you create an AWS account, you gain access to it using the so-called root account (root user). This is an account with absolute, unlimited privileges, a kind of “God mode” for your environment. Compromising this single account means complete and irreversible control for the attacker over your entire infrastructure and data. Therefore, it’s absolutely crucial to never use the root account for daily work. Its sole purpose should be performing initial, secure configuration, then storing it in a “digital safe” and using it only in emergency situations. Configuration mistakes made in the first hours of the account’s existence are the most common cause of breaches because automated bots constantly scan the internet looking for such “open doors.”

What is multi-factor authentication (MFA) and how to configure it?

Multi-factor authentication (MFA) is the most important single defense mechanism for your AWS account. It requires providing, in addition to a password, a second, one-time code generated on a physical device you possess (usually on a smartphone in an authenticator app). The absolutely first and non-negotiable step you must take immediately after creating an account is enabling MFA for the root user. To do this, log in as root, go to the IAM console, then in the security panel follow the instructions to add a “virtual MFA device” using an app like Google Authenticator, Microsoft Authenticator, or Authy. This simple, five-minute process protects you against disaster in case of root account password theft.

What is IAM (Identity and Access Management) and how to create secure user accounts?

After securing the root account, you should immediately stop using it. For all further work, you should create a dedicated IAM user (Identity and Access Management). IAM is the central service that allows granular access management. The proper procedure is as follows:

  • In the IAM console, create a new user group, e.g., named “Administrators.”
  • Attach to this group the AWS-managed permissions policy called AdministratorAccess.
  • Create a new IAM user for yourself (e.g., named john.smith), giving it a strong, unique password.
  • Add this new user to the previously created “Administrators” group.
  • Log out of the root account and from now on use only the newly created IAM account for all administrative work. Remember also to enable MFA for your new IAM account.

How to apply the principle of least privilege in practice?

The Principle of Least Privilege (PoLP) states that every identity should have only those permissions that are absolutely minimal and necessary to perform its task. Granting broad permissions like AdministratorAccess is convenient but extremely dangerous. In practice, for each application and each user, dedicated, “tailored” IAM policies should be created. If an application running on an EC2 server needs only to read files from one specific S3 bucket, you should create an IAM Role with a policy that allows only the s3:GetObject operation and only for the resource arn:aws:s3:::your-bucket-name/*. Then, this role should be assigned to the EC2 instance. The application will automatically and securely receive temporary credentials without the need to store API keys in code.

What are the key elements of data encryption in AWS cloud?

Data protection in AWS relies on encryption in both states. Encryption in transit is largely provided by default – all communication with AWS API endpoints occurs via TLS (HTTPS). Encryption at rest is the protection of data stored on disk and is your responsibility. Fortunately, AWS makes this extremely simple. When creating a new S3 bucket, just check the “Server-Side Encryption” option (preferably with S3-managed keys, i.e., SSE-S3). When creating a new EBS volume (disk for an EC2 server), just check the “Encrypt this volume” option. Under the hood, behind all the key management complexity, stands the AWS KMS (Key Management Service) service, which securely creates and protects encryption keys.

What is the shared responsibility model for security in AWS?

This is a fundamental concept that every AWS user must understand. It speaks of a clear division of responsibilities. AWS is responsible for security OF THE CLOUD. This means Amazon takes care of the physical protection of data centers, hardware security, network, and hypervisor (virtualization layer) security. You, as the customer, are responsible for security IN THE CLOUD. This means you are fully responsible for the secure configuration of all services you use: for managing IAM permissions, for configuring security groups and VPC networks, for patching operating systems on EC2 instances, for encrypting your data, and for the security of your own application code.

How to configure security groups and VPC for resource protection?

VPC (Virtual Private Cloud) is your private, isolated network in the AWS cloud. Security Groups act as a stateful, virtual firewall at the level of individual EC2 instances. Their proper configuration is key to segmentation and protection. The basic rule is: deny everything by default, allow only what’s necessary. For example, for a web server, the security group should allow incoming traffic on port 443 (HTTPS) from anywhere (0.0.0.0/0). However, for a database server, the security group should allow incoming traffic on the database port (e.g., 3306 for MySQL) only and exclusively from the source that is the web server’s security group. Never open database ports or management ports (SSH, RDP) to the entire world.

What security monitoring tools does AWS offer?

AWS provides a powerful set of native tools. AWS CloudTrail is the most important – it’s an immutable event log that records every single API call on your account. It answers the question: “who, what, when, and from where did something?” Enabling and centralizing it is absolutely fundamental for auditing and investigations. Amazon GuardDuty is an intelligent threat detection service that uses machine learning to analyze logs from CloudTrail, VPC Flow Logs, and DNS, automatically detecting anomalies and malicious activity. AWS Security Hub acts as a central dashboard that aggregates and prioritizes alerts from all these services in one place.

What is Zero Trust and how to implement it in an AWS environment?

AWS is a platform ideally suited for building a Zero Trust architecture. Key Zero Trust principles can be implemented using native AWS services. Verify explicitly is realized through IAM with enforced MFA. Apply the principle of least privilege is implemented through granular IAM policies and Roles. Assume breach is realized through ubiquitous monitoring using CloudTrail and GuardDuty and microsegmentation using Security Groups and Network Access Control Lists (NACLs).

How to manage costs and budget during first steps in the cloud?

To avoid unpleasant surprises, financial discipline should be implemented from the very beginning. It’s essential to configure alerts in AWS Budgets that will notify you by email when your spending approaches a specified threshold. You should develop a habit of tagging all resources – even simple tags like Project or Owner will allow for precise cost analysis in AWS Cost Explorer in the future. The most important rule, however, is turning off resources you’re not using. A test EC2 instance left overnight generates unnecessary costs.

What are the most common security mistakes of beginner AWS users?

The list is long, but most come down to neglecting fundamentals. The biggest sins are: using the root account for daily work, lack of MFA on root and IAM accounts, assigning overly broad permissions (.) instead of applying the principle of least privilege, leaving security groups open to the world (0.0.0.0/0) for sensitive ports like SSH (22), RDP (3389), or database ports, and “hardcoding” access keys in code and placing it in public repositories on GitHub.

Where to find further resources and training on AWS and cybersecurity?

The journey with AWS is a marathon, not a sprint. The key is continuous learning. The best starting point is the official AWS documentation, which is extremely comprehensive and detailed. AWS Skill Builder is the official e-learning platform with hundreds of free and paid courses leading to fundamental certification like AWS Certified Cloud Practitioner. An extremely valuable source of knowledge is also the AWS Well-Architected Framework, which describes best practices in five pillars, including the Security pillar. It’s also worth using community resources – renowned blogs, forums, and YouTube channels.

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