I have a macbook pro 2013 15inch OS X 10.8.5. I love this machine. A few years ago I switched from Windows to Mac and I never looked back this machine is awesome and powerful I love it and use it every second of the day but lately I've been having a craving for Linux plus I'm always in the mood for expanding my knowledge for technology and always want to learn new stuff.
To be quite honest I've always heard about linux but never actually tried it the idea of it confuses me in a way. I would like to play with it and learn all about it plus I hear it's important for any programmer to understand how linux works. A lot of jobs are also in Linux!.
I want to learn Linux in and out from how to set it up to all the Linux distribution (distros) like Mint, Ubuntu and Debian, what they're, which is best and how to use them. Thanks!
If you have some time and you would just like to read some good basics start with http://www.linuxfromscratch.org/lfs/view/stable/prologue/for... and go as far as you can.
If you would like to get down and set up a server grab a Debian install kit.
The other option would be to get a RaspberryPI and start with that. Tons of resources and much closer to the hardware as a server install. Good if you re into electronics too.
I am a Mac user myself and you will find that the BSD underneath is mostly what Linux works like. They do say that MacOS is the best BSD available :-) So learning Linux will definitely help you to get much more from your Mac as well.
Have fun!