There are many resources available these days that help with everything from building your first computer to trying to fix it after you have had it for a while. I will give you some of the places that i use on a regular basis when I need ideas or am stuck. My favorite for most thins is a company called Linus Tech Tips. They have great videos on Youtube which range from building a computer for beginners to trying to build a computer that 13 people can game on at the same time. They have a great platform that is attractive to all skill levels.
Here are my top 5 resources in the tech world:
-Linus Tech Tips
-Marques Browiee
-Jonathan Morrison
-Unbox therapy
-PCPartPicker