I choose bitcoin is because, in bitcoin, I don't have to deposit money in a minimum amount to start trading, I can start with whatever amount of money. besides that, I know in shares/stocks or even forex trading we need to have a balance to start like $100 or more or we can use demo account and I don't like about that. for me, trade shares/stocks, forex is more dangerous and too risky because I need to learn many indicators and it is not simple as crypto trading.