Switching from .NET C# to Java/Spring Boot — Tips?

Hey everyone,
I have 2+ years of experience as a Software Engineer working with .NET/C#. Soon, I’ll be working on Java, so I want to prepare properly. Since both are similar OOP-based languages, I already understand backend development concepts and workflows.
Can anyone suggest the best way to learn Java for real-world development? Also, any good courses for Spring Boot and industry-level Java development would really help.
Would love advice from people who switched from .NET to Java as well.