The thing is up to now I never used them and I think this will benefit me after some time greatly it makes many things much easier and better.
- instant spamming your skills by just rolling your head over the keyboard, no need to click with your mouse :) makes it really awesome for champs like Lux that have to fire their shots one after another!
- you can get way more cs with champs like Ezreal
- your reaction time is just better
I know I am a noob for not using it before :/
I'm lvl 30 about 550w and because I am not that new to the game and haven't used them before, so I wanted to share that information with you. So maybe some of you will start to use smartcast!
You can activate smartcasting ingame --> options --> keybindings
scroll down and there you can activate it!