I'm building a new computer. What are something that i need to know before starting?

[mydearpear]

Ok thx a lot.
Anything else i need to know?

 

[velvtelvis]

if you're a longhair (likemyself) or sweat a lot (like myself) you might wanna put somthing on your head. Sweat beads and hair falling into the mobo can't be good for it, plus i got my hair cought in a thermalake one time.