The Clips app from Apple can be used to create video slideshows from your photos. You can add images one-by-one with titles and captions, audio narration and filters. Then you can edit and export the result to share.
Watch at MacMost.com / Watch at YouTube

After upgrading to macOS Catalina, many users mistakenly believe that the new Music app requires that you subscribe to Apple Music. In fact, you can use the Music app just like you used the old iTunes app. You can ignore Apple Music and listen to songs in yoru own library, import new music just like you did before, and also buy music in the iTunes Store. You can also disable Apple Music entirely in the app.
Watch at MacMost.com / Watch at YouTube

Emoji can be used for more than just expressing emotion in text messages and comments. You can also use Emoji characters throughout macOS. They can help bookmarks, files and folders stand out, as well as calendar events and more. You can use them as clipart in Pages, Keynote and even in videos. You can even use them as special symbols in Numbers. They are also useful in the Mail app and you can also use them to search in the Maps app.
Watch at MacMost.com / Watch at YouTube

The Notification Center appears on the right side of your Mac's screen and contains lots of useful information. To get the most from it, you should take the time to customize both the Today view and Notifications view. Eliminating notifications you don't care about and learning how to use the Today view widgets will help you get more from this useful macOS feature.
Watch at MacMost.com / Watch at YouTube

You can create your own transitions for iMovie using Keynote. But making simple one or two-slide presentations that include a transparent background, you can export short videos that can be used as overlays in iMovie. These overlays can be applied to become a transition between one clip and another. They can also be customize with graphics to fit your style or theme in the video.
Watch at MacMost.com / Watch at YouTube