What actually matters in a term sheet?
Far less than the valuation, and far more than founders expect. A term sheet is mostly non-binding, but it sets the terms everything else follows from, and the economic and control clauses matter more than the headline price.
The economic terms:
Valuation and amount, on a stated pre- or post-money basis.
Liquidation preference. What investors receive before anyone else on a sale. A 1x non-participating preference — return their money first, or convert to ordinary shares and take their percentage, whichever is better — is the market standard and is reasonable. Participating preferences let them take their money back and their percentage, which substantially changes outcomes at modest exit values. Multiples above 1x are aggressive.
Anti-dilution. Protection if a later round is priced lower. Broad-based weighted average is standard and moderate; full ratchet is severe and repricing the investor's entire holding at the new lower price can be devastating for founders.
The option pool, and whether it sits pre- or post-money.
The control terms, which founders consistently underweight:
Board composition. How many seats each side appoints, and who has the casting vote. This is where real control lives.
Reserved matters (veto rights). A list of decisions requiring investor consent — raising money, selling the company, changing the business, exceeding budget, hiring above a salary threshold. A long list can leave founders unable to act on ordinary matters, and the list is negotiable.
Drag-along and tag-along. Drag lets a majority force minority holders to sell; tag lets minorities join a sale on the same terms.
Information rights and reporting obligations.
Founder terms: vesting, sometimes restarted; leaver provisions; and restrictive covenants.
What is usually binding even though the rest is not: exclusivity or no-shop clauses preventing you talking to other investors for a period, and confidentiality. Read those carefully, since a long exclusivity period with no deal leaves you months of runway worse off.
Take proper legal advice from someone who does venture deals regularly.
General information, not legal advice.