Installing Mods In Minecraft?

Go on youtube and WATCH somebody do it, but tbh learn vanilla inside out before moding

It's easier to use mod launchers such as ATlauncher and FTB Launcher, everything is done for you, simply download the launcher, find a mod pack, install and press play. You can also use it to make your own mod pack, use the vanilla option, download the mods and use the launcher to add the mods to the game.