Down/delete unused apps
Apps running in the background use resources and most apps now launch very quickly, so there’s no reason to keep them open when you’re not using them. Quit them, either by right-clicking their icon in the Dock > Quit, or hit ç+† to pull up the app switcher, tab to the app and then hit ç+Q. Unused apps tie up disk space, so get rid of them. Use an app like AppZapper to remove everything.