New Handlebars and Finally at the Trails!

Finally took the polygon on an MTB trail and I must say that I am starting to realize that it takes a lot more than just remembering how to ride a bike. Since I am a beginner, I would still like some advice or insight on anything that I am doing wrong and if there are any improvement areas I should pay attention to. Thanks in advance!

[@BJJandBS]

Why not just buy a bar that uses the same stem it came with?