Change Font

Which font? A link to your site is generally necessary for help with CSS questions.

I just found a way:

body{
font-family:Calibri, Verdana, sans-serif;
}

This is a example and you can change it as you want (you should look on the internet for font families)

Did you do this via “Custom CSS” in Customiz’it?
I would like to change things like h1, h2, etc., and paragraph but I cannot find styles.css. Any suggestions? THANKS!
https://www.havebluepower.com

Yes i put this into the custom CSS and it changed everything text to Calibri (https://ii-ec.org/).

I don’t really understand the second part of your question :/

Thanks, Catcher! I also played around with that Custom CSS and achieved a couple things I needed.
By “H1” etc. I refer to the formatting available in the “Visual” mode of editing a post or page. I think these settings are in styles.css but for the life of me I could not find that file! ??

Hmmm,
I don’t know very much about css and I’m also a beginner :/
maybe someone other can help you here or you start a new topic with your question ??

You can either add CSS into the CustomCSS Panel via the Customiz’it! button, or better to use that as a testbed and then create a Child Theme which you will create a style.css.