Introduction

Welcome to Spring!

Almost every Java developer eventually comes across Spring. The container, beans, dependencies, configuration, Spring Boot, web applications, databases, transactions, and security can easily feel like a collection of magic and annotations at first. That is normal. The course is designed to gradually break that “magic” down into understandable mechanisms.

Here, we will not learn Spring as a list of annotations that simply need to be memorized. The goal is to understand what problem the framework solves, what happens inside the application, and why one approach works better than another in a particular situation.

As you move through the course, you will:

• learn Spring from the IoC container and beans to data access, transactions, and security;
• understand what is hidden behind familiar annotations and Spring Boot auto-configuration;
• reinforce topics through practice and learn to recognize common mistakes in Spring applications;
• combine individual framework mechanisms into a complete picture of a real backend application.

How to get the most out of the course

The routine is just as simple: study a topic → reinforce it through practice → return to the difficult part if something is still unclear. Do not try to memorize all annotations and settings at once. In Spring, it is more important to first understand what the components do and how they interact; the details will gradually stick through examples.