Most of these links go directly to content created by YNAB, because they're the experts on their product. But I've curated these ones here for you in hopes it makes it easy to find what you need.
Why Budget to Zero? (Savings blob) - video
Why Budget to Zero? - blog post
How to Prioritize - support document
Rule One in Action - video showing it in the software
A List of True Expenses - YNAB help article with lots of examples
How to Stay Out of Debt Forever - YNAB blog post
Implementing Rule Two - video showing it in the software
What's an Emergency - a way to look at different types of expenses
How to Move Your Money - video showing it in the software
Age Your Money - Support document, videos and text
How AOM is Calculated - support document
Budget Template - written guide
Budget Template - Heard it from Hannah video
Grocery Spending - A calculator from Iowa State to figure out a reasonable grocery budget based on your specific family.
Accounts vs Budget - video
Accounts vs Budget- blog post
Direct Import - Detailed help article
Troubleshooting Common Issues - Detailed help article
Budget Audit - Detailed help article
Finding the Cleared Balance - YNAB help article
Budgeting with a partner - help article with various scenarios
Variable Income - blog post
Varying Pay Cycles - Heard it from Hannah video