Imagine Google tells you that you don't have a URL indexed (shown in Google) in a sitemap with more than 10,000 URLs.
As you can understand, it will be difficult to find out which URL is affected.
If you segment a sitemap into different files (Google will not have any problems with this) such as blog sitemap, page sitemap, product sitemap, image sitemap, video sitemap... it will be easier for you to find out where the error is.
All you have to do is upload all the sitemaps you have created to Search Console and Google will validate that they are correct.
Still, don't trust every error that Search Console may indicate.
I have checked the indexing errors that Google gives in this tool and where it said that everything was fine, there were errors and where it said that there were errors, it was fine.
With this, the only thing I am saying is that you should pay attention to make sure that everything is really correct, especially when it indicates an error.
When you make a change to your sitemaps, it is highly recommended to check them in Search Console.
This way, Google will notice before the update.
A sitemap is composed of the following elements:
URL: URL.
Crawl priority: that is, what is the first thing Google should look at when accessing the sitemap
Images: Number of images in the URL.
Ch. Freq.: crawl frequency indicates how often to access said URL.
Last Mod.: Date of last modification to the URL content.
Now, a little history, when the Google algorithm was first being used, Google number code philippines stated that it used the values we have in the sitemap for “Ch. Freq.” and “Last Mod.” as SEO factors.
Since SEOs modified these values with a script (a little program), Google said it would stop using them, but I'm still not sure if this is true.
This indicates that, if possible, we should try these recommendations.
Especially if you have a specific business model like that of a photographer, since there is a specific sitemap for images or for a company if it uses video marketing as a strategy.
Pages have no viewport tag
This error indicates that the URL flagging this error does not contain the “meta viewport” tag that is used for mobile themes.
Hence, its importance.
Indicates which part of the screen will be visible on a device.
This is its format: <meta name="viewport" content="width=device-width, initial-scale=1.0">
Google is very focused on mobile devices, any failure in mobile will have a consequence; especially since it announced that it had changed the way it works with “mobile index first” or, in other words, being very brief in the explanation: it will use mobile indexing on PC.
Google said that in 2017, 75% of searches would be from mobile devices, even for e-commerce; in 2019, this is an affirmation