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Alex Olhava251 Points
Do I have to use the latest OS X
Do I have to use OS sierra or can I use OS El capitan.
As long as Xcode doesn't complain about it, you are good to go.
Sierra will work fine.
If you're working in Swift 2.0, you will be A-OK in El Capitan. However, if you're wanting to start in Swift 3.0, Xcode 8 will require macOS Sierra because macOS Sierra is built on Swift 3.0 and El Capitan is built on Swift 2.0. Xcode should be backwards compatible, though.