I've never found anything online about this and was wondering if anyone would be able to help me make a fixated header & navigation menu so that when you scroll down it remains at the top of the screen so you dont have to scroll back up to access the hyperlinks & stuff.

Something like:

.header {
   position:fixed;
   top:0;
}

Something like:

.header {
position:fixed;
top:0;
}

 

I'd add:

z-index:2

to the above code.