Can I change my Shopify Checkout page?

Shopify has 4 plans: Basic, Shopify, Advanced, and Plus. Officially, Shopify only allows you to change the Checkout page only in the Plus plan (monthly fee $ 2000 / mo). But Shopify has provided the ability to embed your script on the Checkout page. You can use this opportunity to modify the Checkout page: you can change the elements on the pages, as well as change the appearance using styles.
Your code is embedded in the admin area of the store in the Online Store / Preferences / Additional Google Analytics Javascript section.