What sources of knowledge do you prefer for self-education and professional development?

For self-education and professional development, I prefer to use various sources:

• Official documentation — for example, Oracle documentation for Java, which is always up-to-date and accurate.
• Online courses and platforms — Coursera, Udemy, Pluralsight, where you can get structured knowledge and practical exercises.
• Books — classic and modern editions on Java, such as "Effective Java" by Joshua Bloch.
• Technical blogs and articles — for example, Medium, Habrahabr, where you can learn about new trends and practices.
• Forums and communities — Stack Overflow, Reddit, where you can ask questions and get answers from experienced developers.
• Practice and projects — the best way to consolidate knowledge is to write code, participate in open-source, solve problems on LeetCode or HackerRank.

This comprehensive approach helps not only to acquire theoretical knowledge but also to develop practical skills.