What sources of information and tools do you use to improve your professional competence?

To improve my professional competence in Java, I use the following sources and tools:

• Official Oracle and OpenJDK documentation — for understanding new features and standards.
• Books by well-known authors, such as "Effective Java" by Joshua Bloch.
• Online courses and platforms (Coursera, Udemy, JetBrains Academy) for systematic learning.
• Technical blogs and articles (Baeldung, InfoQ, Medium) for practical advice and news.
• Participation in communities (Stack Overflow, Reddit, specialized Telegram chats) for experience exchange.
• Practice through coding, participating in open-source projects, and solving problems on LeetCode, HackerRank.
• Using profiling and debugging tools (VisualVM, JProfiler) for an in-depth understanding of application operation.

This comprehensive approach helps stay up-to-date and develop skills.