Often on your web hosting site there is a quick install via cpanel such as prestashop. In other other words, as part of your own website on your own hosting you can have e-commerce functionality. Shopify is a different matter... basically your shop is on shopify co hosting, so technically its not a website builder; rather it's like a stall you set out on someone else's turf.
You can use any analytics provides you like, such as Google Analytics or Mixpanel, or use the build in real time analytics dashboard.
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From website builder expert:
Squarespace gives you extensive styling options that the majority of
other website builders do not provide. You can certainly do custom
styling with other website builders, but you need to know how to edit
codes. Squarespace has a style editor that helps you do all the
custom styling without touching codes, from changing of background
images all the way down to customizing thumbnail details.
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The templates Squarespace provide are very clean, professional and follow good design standards so your website is of very high quality without much work at all.
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The templates are all fully responsive, so your users on mobile devices can easily navigate the site with all the images and content automatically resizing.
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From a developer's standpoint. Documentation is snake oil. It looks pretty and gives confidence that you are able to work on woocommerce easily to make plugins that you need. Try using it. It is outdated and breaks.
Because its a basic, free website builder there are quite a few additional costs that add up - most of which are included in subscriptions of paid services. Add-ons, web-hosting, hiring a developer...these are hassles you might not need if you went with a paid subscription.