One of the most frequently overlooked sections of a journal skin, typography is something far more challenging to get right then people think. You see, it's far more then just picking a font and dumping it in. It is, in fact, an art form.
Now, I could waffle on at length about why typography is so damn cool and important and all that, or I could just get to the damn point: How to use typography effectively in your journals.
The first rule to remember is people have to read it. Yeah, that 10px san-serif font may look great on your screen, but for someone reading on a phone, or on a higher resolution screen it's like stabbing them in the eyes