Usually, when you click and hold on the apps and they jiggle, you can directly drag them to Mac Trash. If this way makes no sense, you can uninstall them in Finder. You can open Finder > Applications > find the app you want to uninstall > drag it to trash. Followingly, delete its associated files scattered in different folders one by one. After these actions, you complete the app uninstallation.
Also, you can use a professional app remover to complete this task -- iBoysoft MagicMenu. It gathers all associated files including user files, root files, packages, caches, preferences, etc. for you to determine what to delete. Once you check the files you want to delete along with the app uninstallation, iBoysoft MagicMenu will proceed with the rest of the work. It's quite convenient to use and worth a try!
Finally, an app like Steam has its own uninstallation extension coming with the install package. If you have not cleared its package yet, you can find the uninstall toolkit in the package for the app uninstallation.