There's million-zaggawillion tons of guides out there in the internetjungle, so here's a little compilation to make it easier for new players!
Please feel free to post your own additions (just do it!) and I'll add them to the list, doesn't matter if it's yours or someone elses!
YouTube Channels:
~TheWarOwl - Great guy who talks about strategy, glitches and general tactics! Most of the links posted at first will probably come from him.
~FrankieOnPcIn1080p - Pretty funny guy with a few videos about CS:GO, go to his channel and press videos then search for CS or Counter and you'll find the few goodies.
General tips:
~Custom keybinds
~Spray control
~Sidestepping
~When to reload
Smokes and nades:
-Dust2:.
~~General nade guide
-Mirage:
~~Mirage A site
~~Mirage B site