Hi! I'm trying to rig a 3d cube to learn 3d. Here's what I've done till now. Can someone please guide me on the right directions for this. Any tutorial or tips would be extremely helpful.

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Hello! What are you attempting to do exactly? Why that many vertices?

I can recommend these 3 tips:
https://twitter.com/Er1k4r1/status/1037431932093689857
https://twitter.com/Er1k4r1/status/1037735675142000640
https://twitter.com/Er1k4r1/status/1046349897199505408

You could find the third one especially interesting.

What did you plan to do with those paths and bones? create a complete rotation?
In this case you might consider disabling backface culling in the Spine settings (so that a flipped mesh disappears instead of showing in reverse)

The Coin example in the Spine installation folder displays a technique to fake rotations too.
Coin example

Just a simple rotation with the upper face rotating independently of the lower portion. That many vertex because i'm trying to make it smooth. I'm not trying a complete rotation at all, just maybe about half the way. Thanks for the links.

Will update this post with my progress.