Must have? it's good question
Those are important Prestashop modules you must have for your website, I'm using the modules and see they're very good
1. Blog module (create a blog section on your website)
https://addons.prestashop.com/en/blog-forum-new/25908-blog.html
2. Mega menu module (make your top menu beautiful)
https://addons.prestashop.com/en/menu/27075-mega-menu-pro.html
3. SEO module (display your website on search engines such as Google, Bing, etc)
https://addons.prestashop.com/en/seo-natural-search-engine-optimization/28279-seo.html
