Changing the slug will affect how search engines read your site. Ideally, you'd want it to align with the headline of the page. If that's not possible, try editing the headline into a solid URL. However, remember that punctuation marks and special characters in a URL are difficult to read.
The length of your URL is very important, since search engines will rank your website according to how long it is. Shorter URLs are more attractive to search engines, and users don't want to spend their time reading a long URL. A simple and effi...
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