Hi Ashish,

if you want to add buttons to these banners
please refer to :
https://www.shopify.com.au/partners/blog/building-a-clickable-call-to-action-button-for-your-shopify-theme
to add a CTA section
then put this section into the banner
you can control their position in the banner with CSS absolute position attribute.

when I got time, I will write another article with all details