I would say that about 90% of my knowledge of photography comes from content I find scattered on the web. There is just so much out there to learn from. So many great photographers willing to share their knowledge and experiences through blogs, websites, videos, podcasts, etc... The best part is that most of it is completely free! All you have to do is be willing to look for it and dive in and absorb it all.
You can go on line at any time, in any part of the world and be inspired by the likes of Joe McNally, a respected National Geographic photographer, or David Zeizer, a successful and talented wedding photographer whose blog is updated on a daily basis with priceless information about everything from the business side of photography to how to train your assistants. David's website is so thorough and full of content that I don't know when he finds time to shoot his weddings! Respected fashion photographer Melissa Rodwell has a fantastic blog with several behind the scenes videos where you can follow her thought process through a high end fashion shoot - see all the people who make a fashion shoot happen: models, stylist, hair, makeup, assistants, art directors just to name a few (warning: Melissa's site is not always safe for work).
The point is that these days all you need to improve yourself is the desire to do so ( and a broadband connection).