How to solve missing or invalid H1 and duplicate content in Shopify

[wpamitgupta]

There are errors of missing or invalid H1, missing description, and duplicate content in 4 URLs on my Shopify site.

Following are the URLs. 

https://www.qforyou.be/collections/all

https://www.qforyou.be/collections/all?page=2

https://www.qforyou.be/collections/all?page=3

https://www.qforyou.be/collections/all?page=4

Can someone pls help me, how to resolve this?