How to find broken links of a site effectively?

Everybody keep suggesting to add it. But I don't see the point in a review site. There are many anonymous users who just submit their reaction for a product.

How to Update the Schema Code for Joomla Websites?

Why Global keywords is taking more time for Ranking?

Are there any good Guru's who I can follow as mentors? I am having a hard time learning email marketing. As there aren't many good tutorials for it. Many blogs does provide step by step guide but they are only basics and not to mention many of them such as the "Neil Patel's" blog aren't much actionable at all.

Okay, I hope that I am explaining my query right.

If a site is non-responsive then does it necessarily means that it is non-accessible to all mobile devices.

The reason I am asking this query because I have visited some community boards in our niche which are not responsive. And yet they get traffic and engagement from mobile devices.

Does author bio links get counted? Or, a text link inside the content is more favorable.

To all PPC Managers I ask. Say if you already have a client who sells comic books in one neighborhood of any city. Then will you take another comic book vendor  from the same the neighborhood as your client.

I am not looking for quick solutions. But looking for loyal followers.

Crawler that crawls out any site's page finding broken links or dead links. A crawler that help understand on-site elements of any page and show it as a rating or score to the end user.