What tools do you usually use to produce Unity components?

3D uses 3D Max a lot.

2D has a picture made by Photoshop or illustration, and used a skeleton made of spines.

Unity uses an overwhelming number of free 3D tools. Blender is useful for poor developers because it's a free tool, full of basics, and most of its features are intuitive and easily efficient. Of course, you can use 3Ds Max.

You can fully learn the course if you google it. Fighting!