the absolute best way to install mods imo is to use MultiMC
it's as easy as picking which version of the game to use, installing forge directly from the program, and then adding everything you want from the loader mods tab
in fact it's so good that I think I've used the standard launcher about 3 total times since it was released
what are you guys' favorite mods??
I pretty much always use Quark because it's like vanilla extended, and more extensive mods like Tinkers' Construct, Reliquary, EnderIO, and Thaumcraft, plus Expandable Backpacks and Storage Drawers when there's a lot of stuff to carry around and collect
Survivalist is also nice if you want to make it so you don't immediately progress to having full iron armor in the first 15 minutes of playing in a new world, but I remember it clashing with a lot of other mods