In my opinion the best way to learn is to poke around the platform & create designs on your own, but watching these videos will help to learn the basics.
https://www.youtube.com/watch?v=IoDJzgV8HAo
https://www.skillshare.com/classes/Complete-Web-Design-from-Figma-design-to-Webflow-development/1918569851/classroom/discussions — first half of the course is useful to get an intro to Figma + design principles + lots of practical exercises
https://www.youtube.com/watch?v=Vo0sEPqArRQ along w/ accompanying text
https://www.youtube.com/watch?v=S3uQTNUtczY
https://www.youtube.com/watch?v=plD2XRrK7hw
https://www.youtube.com/watch?v=X6uiNN6GqEw&t=2s
https://www.youtube.com/watch?v=p4vNocXYASY
https://www.youtube.com/watch?v=p4vNocXYASY
https://www.youtube.com/watch?v=rUIhP66a2l0 GOOD Overview