Important Note about Salt: Not all salts are made equal and cannot be substituted 1:1. If you are substituting table salt for kosher salt, you will need to cut the amount called for in the recipe by at least half.
After boiling, make sure to dry the potatoes thoroughly. This step ensures that when you smash them and bake them in the oven, they'll crisp up nicely. The drier the surface, the crispier they'll turn out!
If you smash them thinner, they will be crispier. Keep them thicker, they will be fluffier on the inside.