Notes on Letter Styles
Serifs are best described as a fine line finishing off the main strokes of a letter,
eg. at the top and bottom of an M.
Serifs tend to appear on more traditional looking fonts like 'Times New Roman' which we are using here.
Sans Serif (meaning without serifs) letters have blunt ends.
Sans Serif fonts tend to be more modern fonts like 'Helvetica' which you are probably familiar with.
Notes on Letter Weights
The Weight of a letter describes how thick it's strokes are and therefore how much presence it will have on your print.