67. You only understand what you can explain

In the latest book published on Warren Buffett, titled The Tao of Warren Buffett, by Mary Buffett, the famed investor says that "if you can't easily explain a business to someone else, then you don't understand that business, and should not invest in it."

I think that similarly, if you can't explain to people a topic on which you consider yourself an expert, then you probably don't understand it. Not understanding what you know, makes it that much harder to sell to employers the idea that you are indeed an expert.

It's basically the difference between education and credentialism. For instance, some people master business enough to teach it to first-time entrepreneurs. They truly have a business education, and can prove it by teaching their knowledge.

Others who may have an MBA, but have never taught business, cannot know for sure that they do indeed understand business. This is the "credentialism" trap that most people, unfortunately, fall into. They pay a lot of money and spend a lot of time to get a paper degree.

Anyways, writing a blog is the ultimate test. It proves that you are an expert (assuming that you have at least 100 subscribers). Furthermore, it proves to future clients and employers that you are a passionate individual who is committed to continuous refinement of his/her knowledge, in order to better serve them.