Dynamic block that populates with products based on individual user browsing behavior

This already exists

https://shopify.dev/themes/product-merchandising/recommendations

https://shopify.dev/api/ajax/reference/product-recommendations

That’s a broad overly ambiguous target.

Look into personalization engines and discussions, or just search the app forums here for “product recommendation” etc though you’ll have to filter through a bunch of junk because of the word “recommend”.

A goto for beginners would have been google-optimize product personalization but gooptimize got sunset in september.

DIY’ing this would require being much more specific and good understanding of browsers, javascript and shopify and/or it’s apis.

Good Hunting.