Hello all,
Should I use Yoast and Rich Snippets together? Or no need to use them together??

you need to add structured data code to get the rich snippet.

This is what we call the snippet, the thing Yoast SEO helps you optimize with our Google/snippet preview. So it contains much more information than the normal snippet does. And that's why we call it a rich snippet

Hello Friends,

Rich snippets for product listings in the organic search part; ... We stitch everything together in a neat graph. A graph is an interconnected overview of your site and how all its entities — company, authors, etc. — are connected to that. ... Using the Schema tab in Yoast SEO can help you finetune your structured data implementation.