ACH Payment
Payment sent electronically with your bank routing and account number.
QBO
Abbreviation for Quickbooks Online
Quickbooks Online

Accounting software for businesses

There is also Quickbooks Desktop, but Intuit (Quickbooks' creator) is moving towards all online software.

Routing Number
A number used to identify the bank when sending a payment electronically. Each bank has it's own routing number.
Schedule C
Tax form for individuals who own their own business and are sole proprietors or anyone receiving 1099-NEC income.
This tax form is included with an individual's tax return (Form 1040) and is not filed separately.
W-2
Tax form issued by an employer
Employees of a company use this to file their taxes
Employers have until January 31st to issue a W-2 to an employee
Xero
Accounting software for businesses