https://youtu.be/QUnMWnz7eGU
I learned front noses by drilling ollie nose stalls and then popping from further back than what feels comfy.
You wanna get the shitty nose stalls where your baseplate/wheels don't touch to slide a little bit, that's a good start. Just get that armpit of nose/truck on the ledge, over and over.
Going to regular, they don't lock in like back noses though, you have to twist your back hip out a bit
Pretty much exact same way I learned front noseslides. I find I do them to fakie a lot more just because I can sit in them longer that way.
For going back to regular, I'd also suggest looking over your leading shoulder (like for a front board).
For front crooks, I'd suggest a similar approach where you learn how to stall one first.
I learned by going straight at a ledge (perpendicular/orthogonal), and going for a frontside nosepick, then keep tweaking till you get the wheel pinch. Once you comfortably get into that pinch, start changing the angle until you're eventually getting into it pretty much parallel.
To start grinding, it's all in the toes and commitment.
If I get into the pinch but stick, it means I'm not on my front foot toe enough.
If I don't get in (usually go to front nose), I didn't pop over the ledge enough.
I think both Tom Knox and Jamie Thomas have mentioned some extra tips in their nine club interviews. Head over the front foot definitely helps to sit on them. And lots of wax/learning on a skatepark ledge helps a lot. On concrete, you really gotta push and go fast.