Transactional Information is any information which causes entries in the General Ledger. Examples of these are:
A/R invoices
Customer Payments
Deposits
A/P Invoices
Vendor Payments
Payroll Processing
General Entries
etc

Examples of Non-Transactional information:
Customer\
Vendors
Employees
Inventory Items
System Setup options
etc.

In the video clip the speak says you can create a "customer" report based upon this information, it should have said "custom" report instead.