Url errors are mistakes which are precise to a specific web page. this means that while googlebot attempted to move slowly the url, it was capable of clear up your dns, connect to your server, fetch and examine your robots.txt file, and then request this url, but something went wrong after that.

Crawl errors means the links on your page/website that end up unexpectedly, such as 404. These errors result into cost increase for google crawler and hence decrease in your site SEO.

While google do not find a particular page on web server then crawling error coming. It means either the page url is wrong or do not reside on web server.

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URL errors are errors that are specific to a particular page. This means that when Googlebot tried to crawl the URL, it was able to resolve your DNS, connect to your server, fetch and read your robots.txt file, and then request this URL, but something went wrong after that.

URL errors are errors that are specific to a particular page. This means that when Googlebot tried to crawl the URL, it was able to resolve your DNS, connect to your server, fetch and read your robots.txt file, and then request this URL, but something went wrong after that

site error all related to the structures of the website. When google crawler scan the site and he finds some restrictions or errors it will be shown to the webmaster by message for resolving.

URL errors are errors that are specific to a particular page. This means that when Googlebot tried to crawl the URL, it was able to resolve your DNS, connect to your server, fetch and read your robots.txt file, and then request this URL, but something went wrong after that.