Understand the theory of cashflow: Many entrepreneurs fail to take the business to the next level despite making good sales as they fail to under the concept of cash flow. Maintaining proper cashflow helps you in attaining liquidity and to remain solvent
Learn to interpret feedback and introspect over it: Many entrepreneurs pre filter the feedback to support the idea they are working on it as the feedback they received doesn't support their instinct or their preconceived belief. As a first time entrepreneur you should be open to interpret the feedback from various parts and should introspect to make your product or business better.
Learn to build a team who can realize your vision: To realize your vision you need a team of professionals who can help you in realizing it. You should learn how to identify the talent, communicate your vision to them and later leading them to execute.
Learn to promote benefits rather than features: I saw many entrepreneurs promoting the features of the product but they fail to realize that a customer is interested in understanding the benefits they will get after subscribing to the product or the solution. As an entrepreneur, you should learn how to communicate the benefits of your product or the solution to the group of audience by understanding their requirements.