Pretty much you just jam your front truck in the obstacle I recommend you learn them on parking block first thats how I learned them they are so fun I recommend you Learn them. Slappy grinds are so much fun.

Lift you front truck up onto the curb/ledge then quickly lift your back truck and grind 👍🏻

Think of an noseslide but ollie higher

Make sure you do an angled ollie in, dont come at a 45 degree angle with the ledge

Ollie duuuh

Try to come at a angle