What is hreflang?
When you deal with a business, which is spread out internationally and/or want to exploit markets in different countries, then you will come across this: < rel=”alternate” hreflang=”xx”>. This piece of coding basically shows the spiders, that your pages in another language aren’t duplicate pages, but optimised for users from different regions and in different languages. This will result in people getting to the correct page with their local content.
Hence, use href lang on your language page only if you have similar content, but different pricing/shipping address/ contact information, or if that page is completely translated into another language. It won’t make sense if you implement href lang if each those pages already have unique content.