You can add a ready-made slider gallery or create one in the block you are working in. 

To add a slider, choose a place where you'd like to add the block and click on the "Plus" icon:

A list of the blocks will appear. Choose a slider block which suits you best. These blocks can be found by the controls to navigate the slides:

In certain blocks your can create a slider off the items that you added as a collection. For that, enter the collection settings:

Navigate to the Slider tab:

Enable the slider mode:

Now you can choose the type of the controls and their color:

Check out the article below to learn how you can set the slides to autoscroll:

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