Colours
Colours are a great way to highlight points and to add a little bit of personality to an otherwise boring guide.
Use colours that are easy for the eyes and legible against a white background like this forum. A yellow font would be difficult to read at this size but may look better if it was...
this big?
Maybe not.
Would red work better?
Getting there. Play around but stick to one or two colours at most. Too many and it'll just be too overwhelming to read. Remember it's a guide not an art piece.