Just started playing Diablo 3 and can't seem to google this question effectively.
It looks to me like you automatically gain skills as you level, and at any time you can change the choices you made, as you are just setting which one you are currently using, NOT which ones you want to learn. I have not leveled enough to be sure that this is how it works.
So is this correct? Or are there choices you make when you level (skills/runes/passives) that you can't go back and reconfigure later?