Kit Bashing was first started by buying real model kits and making new things out of all the various parts. Like having legos from a bunch of kits and making something new.
As Blender makes it's new asset manager system, Kit Bashing will become easier and more fun.
Several plugins already have this functionality such as the kit ops plugin. (very fun and fast to make for example sci fi props)
https://www.creativeshrimp.com/cycles-x-speed-test.html Cycles x is faster than cycles. Yay.
If you are getting the dreaded cpu out of memory error, try this first:
Why do you want to do Computer Graphics?
People have a yearn to create. Be it for art's sake and to make money, or to make a statement.
CG GURU talks about Ai and good jobs and what skills will always be in demand to help future proof your choices.
Places to get 3d objects Some are free
You can scan objects using an Apple Ipad pro with Lidar.
You can scan objects using a camera and Photo scanning software.
Character design in blender These Videos show how to make a character
Blender has a video describing how to make a stylized character. Beginner to expert concepts.
Sometimes you just need a little inspiration, some places to find this:
Google images Use keywords such as Concept art, or Blender art, cg art, Spaceships etc.
Bing Images Use keywords such as Concept art, or Blender art, cg art, Spaceships etc.
Blender is a powerful program and if you don't have a fast enough rig, you won't be able to do the things you really want to. Forget about simulations, or large scenes.
Get 32gigs of ram or more, (ddr5 ram just dropped in price), Get a VideoCard with 12gb of vram or more, get a large M.2 drive, and an 8 to 16core Processor.