LLC: pass-through tax, simple, default for solo and small. Best for: bootstrapped, real estate, side hustles.
C-Corp: double tax, but unlimited shareholders + multiple share classes. Best for: VC-backed startups planning to raise on a SAFE or priced round.
S-Corp: not an entity, an IRS election. Pass-through with self-employment tax savings on distributions. Best for: profitable LLCs above ~$60K net.
When in doubt: LLC now, convert to C-Corp at first VC round.
Next action
Turn the lesson into work.
Pick one concrete next step now, while the context is still fresh.