Manage login items and background agents

See what starts by itself and disable the unnecessary.

1. System Settings → General → Login Items: disable what is not useful and look at the "Allow in the Background" section.
2. List the loaded non-Apple agents:

   launchctl list | grep -v com.apple

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3. User agents live in ~/Library/LaunchAgents and system ones in /Library/LaunchAgents and /Library/LaunchDaemons.
4. Unload a user agent:

   launchctl bootout gui/$(id -u) ~/Library/LaunchAgents/exemple.plist

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5. To remove it for good, move the .plist file to the Trash after unloading it.