Deleting or uninstalling an app will remove it from your Mac and make the storage space it was using available for other items. You can do this from Launchpad or the Finder.
Use Launchpad to delete apps that were downloaded from the App Store
Launchpad offers a convenient way to delete apps that you downloaded from the App Store.
If you can't see the app in Launchpad, type its name in the search field at the top of Launchpad. If you have more than one page of apps, you can switch pages by clicking the dots at the bottom of the screen, or by swiping right or left with two fingers on your trackpad.
Press and hold the Option key, or click and hold any app until the apps start jiggling.
Click the Delete button next to the app you want to delete, then click Delete to confirm. The app will be deleted immediately.
If you can't delete an app from Launchpad: the Delete button will only appear for apps you’ve downloaded from the App Store. Delete other apps using the Finder instead.
Use the Finder to delete apps
Switch to the Finder, such as by clicking your desktop or the Finder icon in the Dock.
Most apps can be found in your Applications folder, which you can open by clicking Applications in the sidebar of any Finder window. Or choose Go > Applications from the menu bar in the Finder.
Use any of these ways to move the app to the Bin:
Drag the app to the Bin.
Select the app and choose File > Move to Bin from the menu bar.
Select the app and press Command-Delete on your keyboard.
If you’re asked for a username and password, enter the username and password for an administrator account on your Mac. This is usually the username and password you use to log in to your Mac.
To delete the app after moving it to the Bin, choose Finder > Empty Bin.
If you can't move an app to the Bin: you can't use the Finder to delete apps that are required by your Mac, such as many of the apps installed by macOS.
Learn more
Deleting an app doesn't cancel any subscription you may have purchased with the app. Learn how to cancel subscriptions for apps that were downloaded from the App Store.
So, how to delete the apps on Mac that won't delete? Try the manual removal after force quitting the app in question (press Command-Option-Esc, and if the app is on the list, shut it down) or rebooting your Mac. If you still cannot delete it, it may be preinstalled, so it should stay on your Mac.
Apple doesn't allow you to delete its necessary apps. This rule is extremely important for inexperienced users. However, if you are a computer geek and understand which default programs are safe to remove, you can do it via Terminal. Read also: “How to remove startup programs on Mac.”
On a MacBook, it is known as the “Delete” key or sometimes as the “Backspace” key, depending on its location and functionality. Backspace Key: The primary “Delete” key on a MacBook keyboard is located above the “Return” or “Enter” key. It typically has a left-facing arrow (⌫) symbol on it.
It is located between the Control key and the Command key on a typical Mac keyboard. There are two Option keys on modern (as of 2020) Mac desktop and notebook keyboards, one on each side of the space bar. (As of 2005, some laptops had only one to make room for the arrow keys.)
Press and hold the power button on your Mac until “Loading startup options” appears.Select a volume.Press and hold the Shift key, then click Continue in Safe Mode. The computer restarts automatically.
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next to the app you want to delete, then click Delete to confirm. The app will be deleted immediately.
will only appear for apps you’ve downloaded from the App Store. Delete other apps using the Finder instead. 
