Typography is the style of appearance of text.
Simple is better when it comes to fonts
Display fonts are script blackletter all caps and fancy, should only be used for small amounts of texts such as titles.
Casual neutral exotic or graphic
Comic Sans, Curlz, Papyrus, Hobo, Jokerman, Brush Script, and Kristen ITC are all exampels of overused fonts
Less is more when using fonts. Instead of using different fonts, use complimentary ones or modify the original (Bold italic etc)
Hierarchy is used to guide the readers eye to whatever is important, big and bold will be noticed first and the lesser, smaller fonts noticed next
Leading is the space between lines of text. Default is usually fine.
Tracking is the space between letters.
Kerning is the specific spaces between letters. Bad kerning is bad.