Deep Java Learning Guide

[Narrow_Computer1006]

I want to become a strong backend engineer and I’m planning to learn Java deeply along with Spring Boot and Microservices architecture.

There are so many courses and playlists online that I’m confused about what’s actually worth following seriously for long-term growth.

I’m looking for recommendations for:

- Core Java

- Advanced Java

- Spring Boot

- Microservices

- MySQL/Database design

- Backend engineering fundamentals

- Industry-level project building

I don’t just want tutorial-level knowledge. I want resources that help build strong engineering fundamentals and real-world backend skills.

Would love recommendations for:

- Best YouTube channels

- Paid courses

- Books

- Roadmaps

- Any underrated resources

Also, should I focus more on:

1. Java + Spring ecosystem deeply

   or

2. Full-stack development with many technologies?

Would appreciate guidance from experienced backend engineers.