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Web design plays a vital role in SEO, how?
Suppose, you are ranking on top positions and getting traffic. Now, when any user come to your site and if it is not designed well (also responsive) then...

Not the best but still you can do it as it is a part of the off-page activity.

There are lots of online tools, just search 'alt text checker' and pick up any or do it manually; open page source and search 'img' tag and check if there is 'alt' tag present or not?

It's a web tool of Google that lets you know about trending searches on Google and you can also get it country wise means you can know trending topics of any specific country. This tool can help you...