I can sympathize with people who are struggling with trying to understand the difference between each “version” of SketchUp. I had the same problem when I decided to upgrade from the free version and pay for an annual subscription. This is what I think it all amounts to:
Basically, there are two SketchUp products. A desktop product called “SketchUp Pro” and a SAS product called “SketchUp for Web.”
There is a free version of SketchUp for Web that allows you to play with SketchUp and decide whether it’s the right product for you. If the answer is “Yes” you can upgrade to the subscription version which unlocks some of the functions you couldn’t use in the free version.
If you prefer desktop software products, then “SketchUp Pro” is your baby. This is the version of SketchUp used to create a huge library of official and unofficial instructional videos.
If you’re learning SketchUp for Web using these videos, you’re going to notice that the UII (user interface) is considerably different. As best as I can tell, the functionality in Pro has been replicated in the Web version. Still, expect to do some wandering around when learning SketchUp for Web (free or paid).
Since the good people who frequent this online community started using SketchUp when it was called something else, expect to see references to products you may not immediately recognize.
However you pay for it, I think it comes down to two products: Pro and Web.
Do I have that right?