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I constantly get a message that I do not have permission to perform operations on my home drive (like deleting files, opening folders). I am the only one using this computer. The problems started when I upgraded the OS to Catalina 10;15.7. Please don't tell me to do the "Get Info" trick: I have tried that 3 million times for every file I cannot touch.
Where are the files & folders located? If they are located outside of your home user folder, then macOS prevents you from making modifications to the system files which are now located on a read-only volume:
https://support.apple.com/en-us/HT210650
I have seen File Sharing mess up the permissions to the shared items even if File Sharing is no longer enabled. I forget how I resolved the permissions issue unless it was following the information in the article @rkaufmann87 linked. I might have had to uncheck a box on the "Get Info" section of the enclosing folder as well as it may still have been showing as "shared" even though File Sharing was disabled.
Please refer to https://support.apple.com/lt-lt/guide/mac-help/mchlp1203/mac
Permissions problem
