Hi Thomas.

For whole site, I would start from:

• Template Option > Typography >> https://www.joomshaper.com/documentation/helix-framework/typography
• If you cannot use Google Fonts loaded Google server (becuase of GDPR law) follow the tips 33 and 34 >> https://www.joomshaper.com/documentation/helix-framework/customization-tips#how-to-add-google-fonts-manually
• The law guide for DE webmasters >> https://www.joomshaper.com/documentation/sp-page-builder/google-fonts-and-dsgvo-gdpr

Private tip:

Settings font individually for each addon and Title is a waste of time. Unless you have a few weeks for that. It is much easier (smarter) to set font-family for h1, h2, h3, p, li - in one place (!) Just in case client would change his mind about font type next week.