Font related plugins
Font preview plugins
https://www.figma.com/community/plugin/890494567122693015/Font-Preview
Font Viewer
https://www.figma.com/community/plugin/1027863721483813752/Font-Viewer
Better Font Picker
https://www.figma.com/community/plugin/739922281164562258/Better-Font-Picker
Typescales
https://www.figma.com/community/plugin/739825414752646970/Typescales
Font Scale
https://www.figma.com/community/plugin/741231992144144738/Font-Scale
Text Resizer – Accessibility Checker
https://www.figma.com/community/plugin/892114953056389734/Text-Resizer—Accessibility-Checker
Font Pair
https://www.figma.com/community/plugin/1105220730154050357/Fontpair
Glyphs
https://www.figma.com/community/plugin/849323869157549525/Glyphs
Arc
https://www.figma.com/community/plugin/762070688792833472/arc
Styles related plugins
Automatic Style Guides
https://www.figma.com/community/plugin/838622388628773312/Automatic-Style-Guides
Textyles
https://www.figma.com/community/plugin/804843548882105498/Textyles
Textstyles
https://www.figma.com/community/plugin/803311677045533625/Typestyles
StyleList
https://www.figma.com/community/plugin/927255248672920500/StyleList-%E2%80%93-text-and-color-styles
Style Docs
https://www.figma.com/community/plugin/1086726114862988342/Style-Docs
Figma’s Google Font Pair
https://www.figma.com/google-fonts/
Recommended 
Typography anatomy and terminology for later
https://visme.co/blog/type-anatomy/
https://designmodo.com/letterform/
https://designmodo.com/typography-cheat-sheet/
https://www.interaction-design.org/literature/article/what-is-type-anatomy