Correct way for Hreflang implementation

[TimboH3at5]

Hello,

Through vairous apps and website audit tools - i am getting a common theme of Hreflang not being implemented correctly in our website code.

We moved from Glopal at the start of 2023 and went to shopify markets, targeting mainly the USA and France.

Our main domain language is english and domain is co.uk and but our secondary localised language is USA $ on the .com side of our website. We also have a french translated website but this is set to the co.uk/fr.

How should the code be written in the head of the Liquid theme code.

Many thanks in advance for you help and support.

Tim