The three policies, in one line each
General liability: other people's injuries and property. Workers' compensation: your employees' work injuries. Employment practices liability: your employees' claims about how you treated them.
Where owners get caught
A single-owner business with no workers' compensation hires a helper for a busy season; the helper is hurt. General liability excludes it, and in most states the owner is personally responsible for the medical bills and lost wages, plus penalties for being uninsured. The second common gap is the employee claim that is not an injury at all: a dismissal that becomes a discrimination charge. General liability excludes that too.
What the wallet shows
When your wallet holds general liability but no workers' compensation and the business reports employees, the coverage score flags the gap and the checklist for your industry explains who will ask for it. Quotes for the missing line start from the same application you already completed.