Molly Hellmuth wrote a guide on everything you need to know about setting up icons, using icons in designs, and handing off icons for development in Figma. See also her top 10 tips from this guide on Twitter.
Gleb is right – icons as variants can’t be previewed or searched. In fact, Figma doesn’t recommend using variants to group different icons either. If you have different sizes or versions of the same icon, then you could combine these as variants instead.
The team at Microsoft published a v2 of the Fluent System Icons toolkit. New sizes are available, with over 4.5k icons per theme. The new icons are built with Variants, friendlier, have rounded corners and simplified shapes.
Bureau Gorbunov is one of my all-time favorite design companies. Its designer Sergey Chikin has been drawing a new icon every day for over three years, and now this set is available as a plugin. 266 icons are completely free, and the commercial license includes over 1,200 icons.