I have tried figuring out Sketchup at least three time, starting when if first came out. I'm 71 but fairly computer savy and have used CAD programs for decades. I have given up on Sketchup. The learning curve has been too much.
However, I am currently making a run at using Fusion 360, which is also a cloud-based 3D CAD/CAM program. Because I have some spur gears I want made with a CNC router. With help from someone who uses it commercially, I've been able to create the gears, but that is because there is a script that generates the gear drawing given the properties of the gear that you enter into fields. Very slick.
Fusion 360 generates the G-code and toolpaths required for the CNC operations.
What I am having difficulty with is learning how to draw and place features on the generated gears, but that is just another learning curve matter. I have started the video based tutorials which should get me where I want to be, but I've only just begun and there are many other things demanding my time.
I'm at the stage where I could deliver the Fusion 360 gear files to someone and they could cut the gears with just a single center hole and I would add the other features manually (peg mounting holes and spokes) by modifying one gear of each size into pattern boards for using a bearing-guided router bit.
The learning curve for Fusion 360 seems quite similar to Sketchup, but the difference for me is that I have a reason/purpose for learning now that I lacked when trying to learn Sketchup.
"If you want nice, clean, fresh oats, you must pay a fair price. However, if you can be satisfied with oats that have already been through the horse, that comes a bit cheaper."