Google's Gary Illyes confirmed that Google does indeed check to see if an XML sitemap has a change in it before reprocessing the XML sitemap file. The reason Google does this is because it doesn't ...

Google's John Mueller spoke a bit more about when you should update the date in the lastmod tag in the XML sitemap file. He said on Twitter if you are "providing something new for search engines that ...

As Google’s search results have increasingly become more visual, the importance of image optimization has grown — particularly in ecommerce, travel, and other verticals where users expect multiple ...