The biggest mistake people make when valuing an early-stage startup is not thinking critically enough about the potential of the business in terms of the market and the exit opportunity.
Finance is very dynamic and moves quickly. You have to keep up with the pace of the industry. So keep studying, if not you will get outdated very quickly.
Be prepared even before the opportunity comes knocking. To succeed in finance you need good financial modeling skills or valuation, PowerPoint skills, and soft skills.
To succeed in finance, work on your mindset first, then have a good understanding of risk and then learn about trading. You also need to have good risk management strategies.
Keep on acquiring new skills and improving yourself because new things are coming up in the finance industry all the time. Always have an exit strategy and know when to execute it.