Is it a good idea to buy some crypto for long time investment plan from exchanges such as binance as keep it there, any alternatives ? Because i have heard bad things about some famous exchanges such coinbase.
Yes, it is a good idea to buy some crypto for long time investment plan, but it is a bad idea to save that crypto in the exchanges because you will not know if that exchanges can always protect the member assets. You must hold it on the other wallets, which you can control, and you can access it anytime. Maybe you need to have a hardware wallet or other wallets which support multi coins, so you can get it all in one wallet and save it in your secret place.