Hi I am trying to create a product list site furnitures where every registered member can add and edit his products only I want also to make able to edit his profile (maybe using solspace user)

1.) how is safecracker working I will create a new channel admin and use this for the edit and to add pages calling all the fields that exist already in other channels as if I was where working through ee control panel?

2.)  what about playa and matrix are they fully compatible?

3.) I want to add for the user profile page something like this region - city if he choses region {categories} (A) from a list then it displayed another list cities with option A1 A2 A3 with some {if} statements. Can I do this with safecracker a drop down list with categories and then using if statements display the according cities.

4.) my last question the user can’t delete an entry only change status to closed and then manually I will have to delete them through ee CP ?