# About a book

## 1. Version control (Git)

{% content-ref url="git" %}
[git](https://tester-bszelag.gitbook.io/software-testing/git)
{% endcontent-ref %}

## 2. Linux OS (Ubuntu)

{% content-ref url="ubuntu" %}
[ubuntu](https://tester-bszelag.gitbook.io/software-testing/ubuntu)
{% endcontent-ref %}

## 3. Database (PostgreSQL)

{% content-ref url="postgresql" %}
[postgresql](https://tester-bszelag.gitbook.io/software-testing/postgresql)
{% endcontent-ref %}

## 4. Information about Web service

{% content-ref url="api-and-web-service" %}
[api-and-web-service](https://tester-bszelag.gitbook.io/software-testing/api-and-web-service)
{% endcontent-ref %}