I let my nephew play with my phone and when he does he moves things around and deletes thanks is there a way from stopping him from doing this and still allowing him to use my phone?
Welcome to the forums. What phone do you have? Most stock launchers don't include an option to lock your home screens and you'll need to install a custom one, such as Nova. Another option is to create an specific user for your nephew, so you can limit what things he can access and change.
Some devices have what they call pin window, which means the only thing he can access is the app/window you have opened... It's password locked.
Personally I don't approve of children playing with phones and ours never touch any devices here, ever. It's bad for their development and they usually break phones.