baby milestones?

Hi IMs :)
This is a bit of a weird question, so bare with me!
I have a 3 month old and hes super energetic.
in the last two weeks when hes laying on his back he will lift himself up with his legs and like jump backwards, and if i put him in a sitting position and hold his arms he immediately pushes up so hes standing and he can stand (obviously with my support) for a good minute or so.
Is this a good thing, bad thing, normal? :S Hes my first so in my eyes hes the most amazing baby haha! but i dont like to get caught up in milestones, just wanting to know if im doing everything right.