Return to DSLR, OSX Software?

[clv101]

I used to use my 20D and Aperture a lot. Been a bit busy for the last few years and have hardly touched the camera. Picked up a used 7D as an early Christmas present for myself and to rekindle interest in SLR photography. Any issues with this camera I should be aware of?

What software are people using on OSX now Aperture's gone? I'm looking for similar features, cataloguing and processing. Something a bit more sophisticated than Google Photos, but not has heavyweight/expensive as Lightroom?

Never used a DSLR for video, what do I need to know? What basic editing software us good to start with?

 

[clv101]

You've been gone a long time, as OSX is also long since gone - it is MacOS now!

Turns out I'm still running OS X El Capitan! Four years of avoiding those updates. If it ain't broke don't fix it?
What am I missing out on? I have a MBP 15-inch, Mid 2012, 2.3GHz i7, 8GB 1600MHz DDR3, 500GB SSD.