The range from getting started with iOS development to adding 3D Touch into an app is quite big.
Many video learning sites have been waiting for Swift changes to slow down a bit (see Lynda, Pluralsight etc).
Simon Allardice has done some beginner Swift tutorials at Lynda and his new ones will be out at some point soon with Pluralsight barring any big changes to Swift.
Places like raywenderlich.com have tutorials on most aspects including 3D Touch if there are specific things you want to check out.
In terms of books - again some have been delayed whilst Swift had been changing - the Big Nerd Ranch Swift revamp of their iOS Debelopment book will be coming some point soon (current version is ObjC).
There are some Swift books out there already.