Everybody already knows what the difference is between a serif and a sans serif typeface, but there’s more to that about fonts. If you are looking for a deeper knowledge on the topic, check the Typeface Classification page, you’ll find some useful notions on the typeface naming standard.
Available from the same ‘RedSun’ resource there are some curious tips like Mixing Type and Choosing a Typeface sections.
The glossary is my best choice, now I know what ‘kern’ stands for…