I'm goofy foot so I haven't touched those whack ass challenges
Best way to learn is to watch youtubers and PRACTICE. Also, it's easy to flick your tricks timing the same pace you do in skate. DON'T do that. if you want crispy Tre's, hardflips, etc. get used to scooping one stick at a certain speed and flicking with another. Remember there are no canned animations but once you get the muscle memory down, you can pretty much just LOOK at your board and intuitively control it.
If you wanna reverts, powerslides, or just any kind of 90 degree twist, point your sticks <--> or -><-. Use the triggers to spin with it. You can do smiths and feebles this way too if you figure out the little nuances tweaks and approach towards the rail/ledge
Blunts/Noseblunts are done by approaching at the correct angle/trajectory, ollie, turn about 90 degrees, the point both sticks down or up depending on stance/trick