Ask HN: Setting up Mac for dev work

Having just been laid off from a megacorp, I find myself back outside a technological walled garden for the first time in over seven years. In the past I've done Android development, server side development, data analysis, as well as frontend dev (but I hate it). I'm armed with a Macbook Pro but I have no idea what the latest sine qua non software is for development.

Any recommendations for a software engineer looking to start coding in the real world again?