Downloading apps from the Mac App Store built into MacOS is very simple. It's also a safe way to get new apps on your Mac. Apps here are safe as they are reviewed by Apple directly, so you may find the latest and greatest from Apple or other trusted developers right from the store on your Mac.
Here is how to download an app from the App Store:
1) Open the App Store.
2) Browse or search for an app that you want to download.
3) When you have found the app that you want to download, you can select it to bring up the page for that app.
4) On this page, choose Get and it will turn into a Download button where you can begin the download.
5) The downloaded app will now appear in your application folder on your computer.