Assume, that beside the Apache web server logs I never had any contact with any kind of (professional) logs on any operation system. So Logging, although I understand some basics, is all together a pretty new topic. At the moment the investment to fully learn about this topic seems to be quite huge, yet I don't even know yet, if it is even worth knowing more then the most abstract concepts.

Which resources would you suggest should someone in that situation consume (tutorials, man pages, books) to learn about Logging?

Which logs should a normal Linux user read on a daily/monthly basis? Is the assumption even correct that they are written for human readability or are they generally evaluated and used by other tools?

What should the normal *nix user and software developer know about these logs?

What do you need to know about log rotation, if you are not expected to manage professional web servers with huge loads of events?