Updating apps lets you enjoy the new features of the apps. Whenever there's an update available for the apps, you will be notified of it. Sometimes, an automatic update also happens.
Still, if you prefer to download them together or to review each update before downloading, you can always do so by checking the Mac App Store. Choosing to update from Mac store also proves beneficial as you can pause, restart or cancel the updates.
Here is How to Update Apps from Mac App Store:
Step 1: On your Mac, click on the App Store icon on the dock.
Step 2: There will be an “Update” tab on the top of the App Store window. Click on this.
Step 3: Depending on the number of app updates, the icon will display the number in blue. Click on it to view the list of apps that need updates.
Step 4: Now, if you want to update all apps at once then click on the “Update All” button, on the top right corner.
Step 5: You can update apps individually by clicking the Update button right next to each app.
Step 6: You can use the Pause button to pause your download, if necessary.
Note: Sometimes, you may be asked to sign in with your Apple ID or password to begin the download automatically. Do so to start the download.
The Mac app store will always remind you and show the number of updates requires in “blue” so that you can immediately download them.
While it's generally recommended that you keep your apps up-to-date, there's a little trick that you might find useful. If you're happy with an app already and there's an update to it, make sure you read the changelog for the app before you decide to update. The changelog is the list of changes that the new update includes. This is usually listed under the app description on the App Store. If you find that the changelog has too many changes (most notably those of interface, functionality etc.), you might want to skip the update if you're already happy with the current version of the app.