Not very well known to beginners, but certainly an essential tool to include in the SEO professional's toolbox, is Screaming Frog . A tool that allows you to perform a complete crawl of your website, simulating the behavior of a BOT.
The tool will then report pages with SEO Titles that are too long, but vietnam phone number also too short or duplicated, of headings, 404 pages, the weight of images, broken links, duplicate content and much more.
The free version of Screaming Frog allows you to crawl up to 500 URLs .
Google PageSpeed Insights
Another free tool for analyzing the performance of your website is Google PageSpeed Insights .