Java course

Hey everyone! I need recommendations for a Java course that I intend to take.

1. Is it better to train in a classroom or online?
2. What are the most crucial Java technologies—Spring Boot, Hibernate, Microservices, etc.—that I should concentrate on?
3. Are there any reputable facilities that provide placement support and practical projects?
4. Although I have a few possibilities, I would really like to speak with someone who has actually taken a course. Have any recommendations?

Many thanks in advance!