As a general rule, anything that has your name for the User name can be deleted. But even there, there could be exceptions but deleting something you shouldn't isn't catastrophic if it's something you initiated.
The other stuff like System and Local Services you delete at your own risk 
I doubt you will find any detailed explanations anywhere. Everyone's computer is unique. We have our own combinations of software, anti-virus, malware finders, etc. So you will see different services in the Task Manager even if checked hour by hour.
I'm somewhat familiar with what my Task Manager should have running but once in a while something will show up that I'm not familiar with. Then I just google whatever it is. Nine times out of ten it show up in the list of suggested searches before I'm done entering my task
Once you get an explanation, you can decide whether you want to keep the process running or not.
Joe