How to change the font family?

Hi, I want to change the font-family of post text(paragraphh) same as the title ?any help
Check my website URL: ChatGpt alternative, unleash your productivity (
Anyone can share free themes similar to my site!
I’m using the Journal theme!
I want to use modern-font family

Download your theme

Edit the file Journal-main/assets/css/fonts.css

Zip the theme back up again, then upload the theme to your ghost install

(is this really a developer question? You should have posted this in theme I think).

Thanks, I will ty your recommandations. How to insert beautiful comment system.