Hello, I´m 13 and I´m very interested in Bitcoin, because of this I buy BTC. Actually, I've been studying BTC for over a year to invest. Back to the subject, I buy BTC for 9.200 dollars, and I would like to know if you think it´s a good ideia hold btc until it reaches 20.000. Anyway, for now i´m going to wait btc until it reaches in 20.000 for me to sell. What do you think about my opinion? 
You should be wary little of Internet technology, for example, there are several sites that use fraud Yes,for you; the only way to make a profit is to hold your bitcoin in a safe place for long term and avoid transferring money between sites without reason
He might eventually watch the price of bitcoin grow to $50000 in future which I am sure that before he is even up to age, bitcoin might have even grown to $100k or $150k. Lucky him to have accumulated this coin at that stage right now, it is a good decision that he has made and I hope that like you rightly advise him, he is able to keep his coin in a safe place for future purpose.