What kinds of music instrument can you play and how would you share this skills to others?

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I think I am a musical guy even I didn't have any good formal training just like many people do. I enjoy singing with my guitar and I just picked up all those skills from friends and relatives many years ago. I have never learned it from a pay teacher in a formal way. However, I can still manage to enjoy my guitar with others and sing some songs for fun. I think it is good enough for me. I used to learn piano for a short period of time. It was fun but it was too expensive for a student like me when I was still going to college.I can't share this skills with others since I wasn't that good but just share it for myself. I used to learned a Chinese Piano for three years and it was fun. However, it seems like that when I didn't practice that much and my skills is going backward. Anyway, music is fun but practice is hard to maintain in a busy world and finance is quite expensive for learning music. That's me. How about you ?