What worked in SEO 3 years ago ( or more ) and does not work anymore today?

Sometimes before blurting out on what doesn’t work, one should review what they have implemented on better still NOT implemented on their page. What worked 15 years ago still works today, people should sometimes look to themselves.

I think some people are fooled by randomness. It's not that the same technique doesn't work, but rather there were a specific set of conditions that allowed this technique to thrive, where it might not have in a different context.

Keywords Stuffing : Few years ago people put his targeted keywords on title, description, keywords tags and they get hits from people while information on that page was different than title keys. But after many updates big search engines like Google filter and slap those sites. Now for good ranking you must have add some related contents to your page also. For example if your title is "Digital Marketing Service Expert" then body contents must be related to digital marketing service. If all things will be fine then search engines will consider to give you ranking.