I've been programming in Java for about 3 months. My current aim is to improve my qualifications in this language. I've read on some forum, that the best way is to take part in some open-source projects. But I have no idea, how to search for ones that corresponds to my current experience. My questions are: 1. Are there some advices on how can I improve my skills? 2. How can I find and join open-source projects that corresponds my experience?