Knowledge Base
Business Document Knowledge Base
Learn how invoices, quotes, purchase orders, credit notes, and trade documents work.
Business document guides
Learn how invoices, quotes, purchase orders, credit notes, and trade documents work.
Use these guides to understand common business document workflows and move from document knowledge to online templates.
Categories
Browse by document type
Invoice Guides
- How to Fill Out an Invoice
- Invoice Number Guide
- Payment Terms Explained
Quotes & Estimates
- What Is a Quote?
- Invoice vs Quote
- How to Create a Professional Quote
Credit Notes
- What Is a Credit Note?
- When Should You Issue a Credit Note?
Purchase Orders
- What Is a Purchase Order?
- Purchase Order vs Invoice
Trade Documents
- Commercial Invoice Explained
- Proforma Invoice Explained
- HS Code Guide
- Export Document Basics
Guides
Business document guide library
Start with the most common invoice, quote, purchase order, credit note, and trade document questions.
Learn what invoice fields mean, including invoice numbers, dates, payment terms, taxes, and totals.
Read guide →Understand the difference between invoices and quotes and when to use each document.
Read guide →Learn how credit notes work and when businesses use refund adjustments.
Read guide →Understand the difference between purchase orders and invoices in business transactions.
Read guide →Learn why commercial invoices are important for international trade and customs.
Read guide →Understand how proforma invoices are used before final sales transactions.
Read guide →