Learn the vocabulary. Look up things like 409a valuations, 83b elections, NSO and ISO stock options, the difference between long-term and short-term capital gai

Learn the vocabulary. Look up things like 409a valuations, 83b elections, NSO and ISO stock options, the difference between long-term and short-term capital gains, strike price vs exercise price (plus how and when taxes on options are triggered and calculated), marginal tax rate vs effective tax rate. Probably also worthwhile to learn the basics of corporate finance, like annual recurring revenue (ARR), costs of goods sold (COGS), customer acquisition costs (CAC), differences between cashflow and profit, EBITDA (plus what each of those words mean), capital expenditure (capex) vs operational expenditure (opex). If you understand the vocabulary, it's a lot easier to evaluate whether a given source is authoritative or not. Sign up for Matt Levine's newsletter. He's perhaps starting to be a little overexposed on HN, but he's informative and humorous, and his newsletter is a good way to get a little exposure to finance every day. It's not not startup-equity specific, but check out Bogleheads for generic investing advice.