Venture Hacks
A treasure trove of information on venture capital, cap tables, vesting arrangements, option pools and just about everything entrepreneurs should be aware of when attempting to get Angel financing for their businesses
Khan Academy
An online university. You can learn anything from elementary school to MSC level. e.g if you issue more shares in your company so you can raise additional capital, are the shares you had before worth less? Well here is the answer about stock dilution.