@Lesann
Personally, I stopped worrying about all that many years ago when I signed up for free account with the WP Cloudinary plugin at https://wordpress.org/plugins/cloudinary-image-management-and-manipulation-in-the-cloud-cdn/
Irrespective of the size and spec. of the images loaded into the website, Cloudinary will automatically deliver the best and most optimized image (type and size) to the user based on the screen size they are using.
This is more important now than ever, as developers are working only on desktop machines and large monitors, and users are viewing on small phones screens, in either portrait or landscape more.
Hope this helps. Regards!