Gross profit is the money a business has left after subtracting the direct cost of making or buying what it sold from its revenue. It is calculated as revenue minus cost of goods sold, before rent, salaries for office staff, marketing, interest and taxes. It shows whether the core product makes money on its own.

Equity is the ownership value in a business: what is left for the owners after subtracting everything the company owes from everything it owns. On a balance sheet it is assets minus liabilities. In startups and job offers, equity also means a share of ownership itself, given as shares or stock options instead of cash.

Net 30 is a common payment term on invoices meaning the full amount is due within 30 days, usually counted from the invoice date. It is a form of short-term credit between businesses: the seller delivers first and waits to be paid, while the buyer gets a month to use the goods or service before the cash leaves.