The best brands are always looking to improve. Same goes for personal brand building.
If you aren't learning something new, you're wasting space and hurting your brand. Digital technology makes it easy to pick up some new skills or knowledge. Books and lots of them can be found free and online. There is a blog that lists a variety of sites which offer access to online books, including some audio ones. Discover more here.
I also found the Online Education Database recently and it has 100 free podcasts from the world's best universities. So, if you want to brush up on your quantum mechanics, learn about the historical Jesus or Hannibal, this site is for you. There's also a list of 200 free online courses.