Too many to list. But expecting to get rich quick with zero work is probaboy at the top of the list

Not listening to good advice is another. They ask for advice and then think they know better than the good advice they get.

Also, most are too entitled and afraid of hard work.

Perfectionism - if something is good enough/ MVP, put it out in the market to test.

They sweat the small details.

I run tons of experiments before I both to get a business license or form a legal entity. Sometimes it’s better just to test the idea before you come through all the red tape.

Many entrepreneurs also make the mistake building it before they understand the demand for their product or service. It should be the other way around. Establish where the demand is and then build the product to fit it.

Underestimating how difficult things can be.