Yes, you heard it right. Just install one plugin and your WordPress website is ready for AMP. Which plugin? I will recommend WordPress official Accelerated Mobile Pages Project plugin. It is very simple and will convert WordPress website into AMP for mobile. Don't worry your posts and pages for Desktop will remain the same.
Additionally, if you are already using Yoast SEO plugin then you can also install Glue for Yoast SEO & AMP plugin. Just search in your plugin and you will find. It will help you to correct Metadata and design for your AMP pages.
So, if you want to increase your traffic for mobile pages and want to make it lightning fast, then implement this to convert WordPress website into AMP and you will see the results. After implementing AMP, you can test your pages through Google AMP Validator.
But you have to be patient, Google takes few days to start showing your AMP pages on Google search results.
If you are monetizing your website using Google Adsense then you can create your ads for AMP compatibility. Check this link click here.
You can also track you AMP pages for Google Analytics, check this post click here.