In my personal opinion, podcasts are one of the greatest technological creations of all time. It's internet radio. IT'S ON DEMAND. There is undoubtably a podcast for any topic you are interested in learning about. 

You don't always have time to read or take a class on something you are truly interested in or want to know more about, but there is no excuse to not listen to a podcast about it. You can listen anytime and anywhere.

These are all the podcast I have been AND am currently subscribed to in my favorite podcast catcher - OVERCAST.FM

Give them a Listen.

Click on any podcast to be taken to the feed for the show where you can view all episodes and get a show description. Overcast is a great iOS Podcasting app that I recommend over the default Apple App to everyone. If on Android, I recommend Stitcher.