The online course SketchUp for Garden Designers as been completely updated for SketchUp PRO 2021. Like all my courses the they are video based and using a Windows PC, if you have Mac the differences are not very significant and you can still do this course.
Check out the full curriculum and preview videos on the course landpage https://courses.gardendesignsofttools.com/courses/sketchup-pro-2021-basics-for-garden-designers.
Garden Design Tools 