Christian Bailey wrote a nice article with basic typography notions:
Typography is a central component of design. It gives us an understanding of the heritage behind our craft. It’s one of the primary ways we, as a society, pass on information to others. Imagine a website, a magazine or even TV without text. Typography is a subject that raises passions and it can become a consuming obsession. If this subject is relatively new to you, or perhaps something you want to know more about, then this guide can start you on that journey.
If you want no know more, keep reading it here.