how ?

I want to add date selection to the product display section?The customer himself will enter the date. I don't want to do it with a plugin.Example:https://prnt.sc/0D8ZkM0JaaYY

Theme : Artistic - Art & Craft Store Shopify Responsive Theme 

Which template should I edit to add a metafield to the here text section on "collections" pages?  

I have used the Narrative theme before. How do I find it again? If anyone has it, can you send it?  https://www.shopify.com/sg/blog/shopify-themesDemo: https://narrative-theme-warm.myshopify.com  

Is it possible to create a system where products to be delivered based on the address in a marketplace are listed? Which plugin is required, are there any alternatives or custom solutions available?Example:https://www.freshdirect.com/