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Numerous features can be added quickly in the theme from Jetpack Plugin: Floating Sharing Buttons, Tiled Galleries, Related Posts, Extra Sidebar Widgets, etc.
Recommended Jetpack Features:
Related Posts
Carousel
Extra Sidebar Widgets
Post by Email
Tiled Galleries
If you need help installing and activating these features, please see this tutorial: Getting started with Jetpack.
Here you can see how to add a Tiled Gallery Block in your posts:
You can read more details about this block here and here.