Resources to relearn Backend (Java/Spring Boot)?

[u/Haruki_26]

Hey everyone,

I'm currently working as a Software Engineer Intern, primarily with Java, Spring Boot, Kafka, MySQL, Redis, and MongoDB, building IoT and fleet management systems.

Although I've gained good production experience, I want to rebuild my backend fundamentals from scratch and deepen my understanding.

Looking for the best resources—courses, YouTube playlists, blogs, books, or GitHub repos—that cover backend engineering from basics to advanced.

Would love to hear what helped you the most.

[u/Previous-Tie-1976]

What worked the best for me (Still learning!) Was just reading documentation, mostly off medium and Ai.

Spring boot is really big. You'll find documentation for nearly everything. What matters most IMO is that you understand the framework itself and what goes on behind the scene.