Just make sure that the E-books are indeed written by people in the know. Buy a book a month from your favorite bookstore. One informative, educational book a month is twelve months of education that will serve you well. Set goals to read during your one hour a day and to apply a principle a week. Listen while you work.
Audio tapes can be the single best learning device for busy entrepreneurs.
Just plug the tape in while your driving, cooking dinner, or doing mundane business chores that don't really take your brain to accomplish. This is like doubling up your time. Audio tapes are available on almost any subject and many books are converted to audio tapes for easy learning where ever you happen to be. Set goals for your education so that you are always moving forward and ahead of the competition. Take the time to learn about new products and services that you might add to your selection of current offerings.