Just tried using the Goon rig (courtesy of Racche on Blend Swap) to do a jump exercise. Critiques welcome.
https://youtu.be/ArZCs0klAH0
Good work as the beginning! 
It will be good to see more line of actions, follow through and overlapping actions.
Looking pretty good! The one thing that stands out to me is that the character moves at the same speed, he should be slowing down as he rises to the top of the jump, then he should pick up speed as he drops back to the ground. Just like a bouncing ball…
Good job,
Randy