Ummm what is the question again? If I am just being simple...
I like www.steampowered.com for PC Games.. it is an interactive platform you download, and allows you to purchase and download all types of games old, new, just released, etc... really awesome!
www.blizzard.com for games like Diablo 3, World of Warcraft... if those are your things... RPG's that is.
I only use NewEgg.com to buy PC Parts, I've built over a dozen desktop computer setups by purchasing the hardware and parts from them. I've purchased a copy or two of Windows XP, 7, or whatever Operating System we're stuck with nowadays....
As for learning things... www.google.com is your best friend, I learned how to replace the headlights on my truck from a video I found on www.youtube.com as well. You can search Google for anything, and probably learn any silly little thing you are looking for. Yes, it's ridiculous how the internet and now thanks to search Engines like Google how the world has become such a smaller place 😱