1. Not Setting a Concrete Goal

"Lack of direction, not lack of time, is the problem. We all have twenty-four hour days."

― Zig Ziglar

Without a concrete goal of what you want to achieve you are likely to become a jack (or jill) of all trades, and master of none. It's fine if you don't know what you want to achieve in your life, yet know what you want to achieve in a course.