Someone wanted to learn this too, so Grasp built them a personal learning path.
You can keep exploring this one or create a path like this one shaped around you.
Recommended resources
Module 2
Company Setup in QuickBooks
Module 3
Managing the Sales Cycle
Module 4
Managing the Purchasing Cycle
Module 5
Banking and Reconciliation
Module 6
Advanced A/R and A/P Management
Module 7
Payroll Processing
Module 8
Period-End Adjusting Entries
Module 9
Financial Reporting and Analysis
Module 10