How do I adjust the font size?

To adjust the font size for the whole document, you can set a global option in the documentclass - see e.g.

The default article class is limited to 12pt, but you can go up to 14, 17 or 20 points if you use the extarticle class, e.g.:


For details, please see

To change the size of the font within the text you can use commands such as \large - see this blog post on for more details and examples.