Sign up for a free Shopify Partner account at partners.shopify.com. Log in to your Partner Dashboard, navigate to Apps > Dev Dashboard > Dev stores, and click 'Add dev store'. Enter a store name to create your development store (free, no credit card needed).
Install Node.js (v18+), then install Shopify CLI globally:
npm install -g @shopify/cli@latest
Authenticate: shopify auth login --store=your-dev-store.myshopify.com. Verify with shopify theme info.
Why this step matters:
-Establishes a safe sandbox for testing code without affecting live stores
-Provides access to CLI tools essential for efficient local development