Welcome to the Shopify Community. Thanks for reaching out here.
To confirm, are you wondering how to create a theme on Shopify? Are you new to coding and developing, and wondering how to get started from scratch? If you haven't done so already, feel free to create a free Shopify Partner account, which includes a range of benefits for individuals and businesses looking to work on Shopify.
Building a theme on Shopify involves a certain knowledge of HTML, CSS, and Liquid, which is Shopify's templating language. If you are not comfortable with HTML, CSS, and Liquid, you may want to consider hiring a Shopify expert or using a pre-made theme from the Shopify Theme Store.
You can build a new theme from scratch, or build it on top of Dawn which is our reference theme. I would highly recommend checking out the Shopify Developer resources about getting started with creating themes here, as it includes everything you need to know to get going. We also have some handy information on our Partner Help Center which has some resources.
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