What's the best way to customize a Shopify theme without coding knowledge?

Store Design
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@janavi2905 - you can check customization settings, and use some page builder app like pagefly

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Hello @janavi2905 ,

Yes as Suyash1 mentioned you can page builder app for it.

Using page builder there is no need to edit the code.

btw I suggest GEMPAGES for it.

Thanks