So wen I give my son my phone I don't have to worry bout him going into apps I don't want him in ..just to b able to lock any stick app
If there's just one app you want him to use, try Guided Access in accessibility. You can lock him into one app, and he can't go anywhere else. For example, if he's playing a game, he has to stay on that game unless you change which app he's on. If you have never used Guided Access, I suggest you check it out. It comes in handy also if you let someone like a friend use your phone for something specific. They can't snoop around.
Sent from my ancient but trustworthy iPhone 5. ☮