How do I change my font/colours/logo?

To change the system font, navigate to Admin > System > Configuration and expand the User interface section. A custom font file (extension woff2, woff, ttf or otf) can be uploaded with the Custom font file option.

From version 11.1: A separate font can be set for page headings as well under the Custom heading font file option.

You can change more UI elements in Admin > System > Configuration > User interface via the "Colour theme" dropdown.