Banner
To customize the banner in home page, go to Sales Channel > Online Store > Themes > Customize. There you can see the list of configuration available for all the sections of home page.
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In left side bar, you can see the slideshow dropdown in home page editor. Click on the slide that you like to update.

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Update the image, contents or button detail as you want and click 'Save' button.

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Click on Save button. And you can see the updated content in your banner slide show
 
