There are so many rule.

The rules for effective SEO have shifted seismically over the past few years. ... The days of driving traffic to your site by packing headlines with keywords are long gone, experts say, and the new SEO strategy revolves around another big-money marketing focus experience.

There is only one rule and that is Follow Google's SEO Parameters.

Instagram advertising opens new doors for businesses to reach their target audience. You can potentially increase your revenue if you know the tricks of Instagram advertising.

WHITE HAT SEO has become the best techniques when it comes the best SEO.
Some rules are as follows:-
1. We should work with white hat SEO
2. Should write quality content
3. Don't do keyword stuffing
4. Use proper keyword