Hi @hamzaejjamlaoui when it comes to customization pages you might face up some difficulties with building landing pages since Shopify is very limited with page building. Please consider PageFly page builder app as the solution We have the affiliate program as well to reward FIverr freelancers.
Some PageFly stats:
- #1 in Page builder category - https://apps.shopify.com/browse/store-design-page-builders
- 30,000+ active merchants
- 2,000 five stars reviews on the Apps Store.