[A block of text creates a certain texture based on the thickness and evenness of letter stroke, the serifs.]

[A font's point size is based on the difference between the tallest ascender (like the tip of a 'b') and the lowest descender (like the tail of a 'p').]

[Body copy tends to look better with a leading / line-height of 120% to 140% of a type's size (1.2em to 1.4em).]

[Similar character widths make for better pairings.]

[Typefaces are built for specific mediums such as print or screen.]

[If you seperate paragraphs with space, a full line break is usually too much, better to have 0.8em.]