10. Building A Team Is Hard

Finding co-founders by themselves is very hard just by itself. Finding a group of individuals smarter than yourself across a broad range of skill takes up way more time than you would ever think.  In the early days, you may be super excited about your company, but it's often hard to get a large group of others equally excited. They may have their own ideas they want to work on, be comfortable with a cushy salary, or generally just not interested in what you're doing. Just because you're excited does not mean others will be excited.

11. There Are Forces Outside Your Control

You have to understand that you cannot control everything in the universe. Markets collapse, the government intervenes, tragedy strikes, and other unforeseen circumstances. You don't let this make you quit. Life as an entrepreneur is hard, but if you really love what you're doing and have the determination, you WILL do it.