first, hunter safety. A lot of these will help you learn about game, but most importantly about safety.
Should I just watch a few youtube videos and try my luck?
Youtube is good. read, read, read. If you can, get time in the woods ahead of time.
Learn what deer do.
The most basic things: Be upwind or quartering the wind. Be quiet. (There's no such thing as too quiet) Don't fidget. If you must move, do it sloooooow.
I have been busted by deer more than anything by getting caught moving. Turning my head too quick caught a deer's eye when stand hunting, or one step too many or one step too quick when stillhunting.
A good way to practice for deer is to hunt squirrels. If you're alerting squirrels, you'll definitely alert deer.