Sketchup Free for 67yr old grandpa and 12 yr old grandson to build backyard deck?

I would not mind buying the personal edition but I thought we would try the FREE on line version to make sure we could work it at all and I see many tutorials and self help videos when I google sketchup tutorials and I see that there are a lot of videos for PRO and other versions that dont work like the FREE version. Can someone please point me to or recommend a series of courses or tutorials that focus specifically on getting started with the Sketchup FREE version.

Try searching YouTube with “tutorials for sketchup free”.