Shopify Lite is primarily suited for merchants with an existing website that needs a functioning online shop section. To sell on Facebook, Instagram, Pinterest or other social media, you would need to upgrade to at least Basic Shopify.
Although limited on where to sell online, Shopify Lite can be just what you need if you:
Don’t want to transfer an existing website to an ecommerce platform: If you already have a website, but would rather not change it by transferring it to an all-inclusive ecommerce platform, the Shopify Lite Buy Button could be a perfect compromise.
Want a low-cost, integrated solution to selling in person and online: Shopify Lite is a lightweight POS-and-online-sales combo that gives you just the essentials for a small, multichannel shop to thrive.
Have some online presence and want to sell face-to-face: If you have a blog or Wordpress site already, Shopify Lite can be the low-cost way to delve into face-to-face selling.
Shopify Lite is not suitable for people looking for a complete online shop or full POS system (unless you upgrade to POS Pro). For a fully-fledged online store built on Shopify, you should go for Basic Shopify or one of the more expensive plans.
The main question is whether Shopify Lite is worth the monthly fee when you can also get buy buttons, invoicing and POS payments without monthly costs through Square and PayPal. That said, if you’re planning to build a serious online store with Shopify at a later time, then it makes sense to start with Shopify to avoid switching payment system later.