Two hundred terms. One sentence each

The whole vocabulary, defined plainly. Comes free with the kit (PDF + 1-page print version). A taste:

ARPU

Average revenue per user, over a chosen window.

CAC

Customer acquisition cost — what it costs to land one paying customer.

Churn

The share of customers who stop paying in a given window.

Gross margin

Revenue minus the variable cost of delivering one unit, as a percentage.

LTV

Lifetime value — the gross profit one customer generates before they leave.

Runway

How long the business survives at the current burn rate without new revenue or cash.