Simple but some good tips - Body copy is often sans serif - Give Words Some Space
Pay Particular Attention to Alignment - Use left alignment for larger blocks of text. Anything that requires actual reading should be left-aligned. - Use center alignment for special, short bits of text. Centering can be the perfect solution for a headline or simply call to action.
Create Subtle Contrast: Users should not have to pinch and zoom to read the words on the screen.
When it comes to typography these elements will be different based on the device: - Type size - Line break - Colors - Font selection - Orientation - Kerning (left-align, river flow)
App typography will set the tone for everything else. Apps are leading the way when it comes to design and typography.
Among the top 10 are Proxima Nova, Museo Sans, Pluto Sans, Helvetica Neue, and Futura. All are medium weight sans serifs with somewhat condensed letterforms.