How can I change the keyboard shortcut for switching tabs in Mac Terminal?
I know that you can switch tabs with shift cmd [arrow key] in Mac Terminal, but it is painful to reach the arrow key. How can I change the default keybinding?
Before Sierra (El Capitan and earlier), 
You can change key bindings for almost all Cocoa apps in System Preferences, including Terminal.app.
Go to System Preferences > Keyboard > Shortcuts > App Shortcuts, then add a new shortcut for Terminal (located in /Applications/Utilities).