The one thing people aren’t mentioning is what to look for in the .uproject file (basically because its so simple they assume you’ll know). I was in the same boat as you. I didn’t understand what they were talking about…
Until I opened my .uproject file and took a look. Then it was obvious. Here is my uncorrected .iproject file:
Delete the highlighted plugins (only the unneeded plugins will be listed).
I hope this helps clear it up!