want to know What is a CDL driving record summary?
Yes
CDL business summaries show expanded driver history information that is not available in a standard Driving Record. This includes convictions, suspensions, reversals, and other license actions in any state on any type of vehicle. Information on medical certification status and self-certification information is also provided.
What do I need to create a MyDMV account?
To create a MyDMV account, you will need  a New York State license, permit, or non-driver identification or   your New York State license
and what is a summary of the driving record?
A summary of the driving record is a certified DMV record. All include a certification statement and the signature of the Commissioner of Motor Vehicles, as well as a safety watermark
And another question, what is the main theme of this guide?
the main topic is DMV Records
What do I do if I can't access MyDMV?