I'm getting a new iPad and want to erase what I have put on the old one. If I go into settings and erase all content and settings will it erase everything or will it leave the apps that were on the iPad when I received it? And will it erase my iPhone too?
iPad, iOS 10
It won't erase built-in Apple apps (but will erase any user data related to having used those apps) and it won't erase anything on another device. See the following for complete instructions: What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support
It won't erase built-in Apple apps (but will erase any user data related to having used those apps) and it won't erase anything on another device. See the following for complete instructions: What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support
Erasing content
