There are two general categories of typefaces: serif and sans serif. Sans serif typefaces are composed of simple lines, they are visually cleaner and more modern in feel. They are suitable for large headlines and for short texts. They are easier to read on the screen as fewer pixels are required for their display. Serif typefaces use short serifs or counterstrokes and make them easier to read. They have a more classical feel and are very suitable for longer texts.
Less is more
The use of too many typefaces in one document often makes it look messy and unprofessional. A large variety of fonts will often confuse the reader. It's good to use no more than 2 or 3 fonts and to always stick to the same type. This will allow you to develop a personal style which is recognisable for your readers.
Everyone is a designer
Everyone who publishes texts may want his copy to look neat and legible. There are some basic rules that are not difficult and which do not require sophisticated or professional software. These basics can be applied in any wordprocessing programme and are most probably already practiced by you. On a regular basis, I'll post some tips and tricks to optimize your copy. So everyone can be a designer.