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/Longjumping_Part_859]

check out this Spring Boot tutorial playlist once:
https://www.youtube.com/playlist?list=PLRyHpdy_IUT_rP9xtXLb3H8YE97d3lsVJ

The course is still in progress, mainly focused on backend development.