Customizing Shipping Page & Adding External Shipping Methods with UI Customization - Need Help

Hello Shopify Community,

I am looking to customize my store’s shipping page and add some external shipping methods, along with some UI customization similar to the https://prnt.sc/Eiu_Qx9Rjook

I am having trouble finding the right resources and guidance on how to accomplish this.

I have explored Shopify’s documentation but it seems not to be enough.

I am wondering if anyone has experience with this type of customization and could offer some advice or resources to help me achieve my desired outcome.

Additionally, I would appreciate any suggestions or tips for making the shipping page more user-friendly and visually appealing for my customers.

Thank you in advance for any help or guidance that you can provide.