seachai

On iTerm2 - Open Preferences > Profiles > Keys > Key Mappings > Presets > Select Natural Text Editing

- You can move a word backwards using Option ⌥ + ← and a word forwards using Option ⌥ + →
- Move to the start of the line using fn + ← and to the end of the line with fn + →. 
- Also you can delete a word backwards using Option ⌥ + ⌫, delete the whole line using Command ⌘ + ⌫.

If the preset doesn't appear, reinstall iTerm2. If you installed it using Homebrew + Cask:

brew cask reinstall iterm2