rails are fairly unique and they are my second favorite part of skiing right under switch skiing. Most parks have rails that are just basically narrow boxes without the plastic, or low consequence rails for beginners. Just commit to sliding at 90 degrees and stay centered when you get on them.
Pipes are legitimately just you going inside of one and skiing it, pumping the transitions, and trying to get air so you can get comfortable with them.
Jumps are just about trying new shit honestly. its fairly hard to find something to practice jump tricks on during the winter unless you have indoor facilities with tramps, but jump skiing is still different from tramps. just try stuff out on low consequence stuff like everything else.
Just like skating, it takes years for most people to be good at park so don't feel bad if you aren't progressing as fast as you want.