Tinypng
Reducing the size of images greatly speed up the website, it also helps with the ranking of the website, This tool reduces the image in size without losing its quality. It can handle WebP, PNG and JPEG compression
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XML-Sitemaps
This sitemap generator easy to use. By placing a formatted xml file with site map on your website, you allow Search Engine crawlers (like Google) to find out what pages are present and which have recently changed, and to crawl your site accordingly.
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Freecodecamp
Learn to code — for free. You can get the certifications here of a lot of different programming language, but what I find useful are the tutorials. Sometimes you forget the syntax, how was that code again? Their tutorials are really easy to understand.
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Brokenlinkcheck
Online Broken Link is a free online web-site validator / integrity checker / problem detection tool that can check your web-pages for dead links, validate, find, and report broken hyperlinks if any found.
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