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Learn OSX Terminal
OSX Terminal is ubiquitous in modern web development, but to many people it's a mysterious world of cryptic commands and confusing error messages.
Terminal is the expected environment for projects built with NodeJS, Ruby On Rails, Python and many other languages; and it's the de facto standard for using Git.
It only takes a short time to demystify OSX Terminal, taking it from an annoyance to one of your most powerful skills.
You don't have to give up your current tools to get the most out of Terminal, either - eg. it's common to use Terminal for build tasks, but still code in an editor like Sublime or Atom.