If you have discovered the amazing world of iTerms and you can’t jump forwards or backwards by words, here is one way of how you can do this.
Open up preferences or press ⌘+, and go to Keys > Key Bindings.
Click the ‘+’ down below and select the following:
Keyboard shortcut: ⌘← (ie command and left arrow)
Action: select “Send Escape Sequence” from the drop down
Esc+: type ‘b’