attempting to read Logs without a real destination in mind is the path to madness.
If you want to post something that might be helpful, post a kernel panic report.
Kernel Panic Reports are stored at:
/Library/Logs/DiagnosticReports
If you copy and paste that string into:
Finder > Go menu > Go to Folder
it will take you to where those reports are stored.
They are named with Date&Time and start or end in ‘panic’
If you find one, please post the entire report here, by using the “additional text” Icon in the reply footer (looks like a paper with writing).
Please don’t post more about 20 lines of any other types of reports — they are interminable, and any information useful for this purpose is on the first screenful.
There are three quick take-aways from any panic report.
1) The panic-reason,
2) the extensions present at the "scene of the crime", and
3) the BSD process in which the problem occurred.
One more item that is important is the names of any third-party Extensions you have added. They are shown FIRST in the extensions loaded section
If the above is just "word-salad" to you, just ask and Readers can explain a bit more.