how to get rid of unwanted system modifications
Mac Mini (late 2014). OS Catalina. Web browser and email slow to a crawl, temporarily fixed by restarting, but only for a few hours. EtreCheck says I have a large number of system modifications running in the background and lists them.
Problem is, I don't know which ones I don't need, and I don't know how to remove or disable them. When I look at help sites or You Tube hep videos, they assume more knowledge of the system than I have, or my System Preferences don't display they way these sites picture them.
Can I find a reliable application that will figure out which background programs I don't need and delete them for me? If you answer, speak as if you advising a complete novice. TIA.
Mac mini, OS X 10.11