Just open Files (nautilus file browser) and press Ctrl+H to view them.
When the software opens, search for browser Google fonts from left pane, preview, and finally click the download button to download (which also install) the selected font.
You can also open terminal (Ctrl+Alt+T) and run command to install the tool: sudo apt install typecatcherĢ.) Open Typecatcher, search and install Google fonts: Open Ubuntu Software, then search for and install the ‘Typecatcher’ package. You can preview fonts with adjustable size and text. There is a handy graphical tool called Typecather, which allows you to search, browse, and download Google web-fonts for off-line use.
This simple shows Ubuntu beginners how to easily download & install Google web fonts in Ubuntu 20.04 LTS.