Help other users by answering their questions and propose solutions to their problems on the comments section.
If you have some spare time and you’re willing to help other users with technical problems, you should seriously consider reading through article’s comments and help other Java Tutorial Network users by solving the problems you know how to fix.
Most of the tutorials on Java Tutorial Network contain examples. Some users experience problems by compiling them, or understand the concept behind particular commands. Those users are asking for help in the comments section under the article.
Depending on your skillset, knowledge and spare time you can be of great help to those users by suggesting code fixes and solving problems. Your helb will be highly appreciated.