You'll have to evaluate which exchange you want to use for each of these three actions: 1) buying 2) holding (exchanges are targets for hackers whereas with a

You'll have to evaluate which exchange you want to use for each of these three actions: 1) buying 2) holding (exchanges are targets for hackers whereas with a private wallet you can be hacked, or you can be virused, or you can lose it of your own fault) 3) selling & withdrawing