Beginner's questions about questions

Hi,

I now also belong to the group of people who want to view and analyze the CAN data in their car.
I have a few questions now.
When the ignition is off, the amount of data remains within reasonable limits. However, I would like to know how I can identify the commands that are 'only' auxiliary functions. Turning the navigation system on or off generates approximately 1000 lines of code each time.
Similarly, when recording changes in the instrument lighting, there were approximately 1000 lines of data.

It's different when the ignition is turned on. Is there any way to properly view the data? Or can you only use the timestamp as a reference point?
Are there any fundamental block commands, meaning that command A is always sent at the beginning of a sequence of commands, and command X always ends a sequence of commands?

Perhaps someone will have mercy and be able to provide me with some answers.
Thank you in advance to everyone who tries.