The best way to get started is to read through help.shopify.com/en/api/getting-st....
I'm not a Shopify dev per se, but I work on ecommerce sites and write some Rails code. It is really useful to have a firm grasp on Liquid as well (Shopify's templating language).
Thank you for your recommendation. I have created shopify app on local and begin to read the document, I hope I can be a shopify developer in this year.
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