Apple replicates many of its utilities that appear with graphical interfaces in macOS as terminal commands. That includes Software Update. Follow these steps to halt reminders and remove the red badge from System Preferences showing an update. Launch System Preferences and click Software Update. Click Advanced. Uncheck the first three boxes: Check for Updates, Download New Updates When Available, and Install macOS Updates. Click OK. Now launch Applications > Utilities > Terminal. Enter the following commands below, copying each line and pasting it, then pressing Return at the end. *NOTE: where it says "macOS Catalina" in the first command, replace that with "macOS Big Sur" if you are wanting to ignore the macOS Big Sur update. sudo softwareupdate --ignore "macOS Catalina" defaults write com.apple.systempreferences AttentionPrefBundleIDs 0 killall Dock The first item disable updates for macOS Catalina; the second and third prevent the red badge in System Preferences and restart the Dock (without affecting the rest of your system) to reset the state of the System Preferences icon. The red badge will return, however, every time macOS checks for updates. Opening the Software Update preference can trigger that check, which then causes the badge to reappear! If you’d like to get updates that include macOS Catalina, return to the Terminal and enter this command, followed by Return: sudo softwareupdate --reset-ignored

Restarting through the menu bar 1. Click the Apple icon in the top left hand corner of the screen. 2. In the dropdown menu that appears, hit "Restart..." 3. The computer will shut down and come back on a few moments later.                           

See attached

https://apps.apple.com/app/macos-catalina/id1466841314?mt=12

How to Remove Wi-Fi Access Points on your Mac:   Click on the Apple icon in the top left-hand corner of your screen in the Menu Bar.      Select System Preferences and then click on the Network icon.     Select AirPort from the list on the left, click the Turn AirPort Off button on the right, and then select Advanced.      Under the AirPort tab, you will see a list titled Preferred Networks listing the Network Name and the Security type.     Select the networks to be removed by pressing and holding the Command key on your keyboard while clicking on the network names. If you wish to remove all networks in the list, click on one of the networks listed and press Command + A to select all the networks.  Once you've selected the networks to be removed, press the minus (-) button below the list. Then, click the OK button.     Click the Apply button and then click the Turn Airport On button.