Create CGI spider animation
No, Blender does animation as well. Here's an example of a spider animated with it:

                
            

However rigging and animating a realistic octopod is not exactly the kind of project you'd start with as a newbie. There's a lot to learn.

But if you want to have a go, you could start with this tutorial on rigging a spider's leg in Blender:
https://www.blendernation.com/2011/03/16/how-to-rig-a-spider-leg-in-blender-2-5-tutorial/