What's the right way to customize font?

[kailiu42]

Sorry if this is a stupid question, but what's the right way to customize the font without modifying any file from this theme?

I noticed that fonts are defined in the file sass/common/_variables.scss. I can change $font-family-sans-serif in it to what I want and it works. But I prefer to achieve that from my own site files. Any way to do that? Thanks.