What to know before starting building a home PC computer?

[bystro]

Hello.
I am newbie to building computers.
I really want to learn.
By searching on the internet i find some guides but they are very basic. What I am searching is very detailed explained guide about every component what to choose and what not by this year (2014-2015). Also will be good to know about Monitors.

 

[Karl_oh]

This should help: http://www.tomshardware.com/reviews/build-your-own-pc,2601.html