The 22 Immutable Laws of Marketing by Al Ries and Jack Trout is a marketing classic outlining timeless principles for successful branding and strategy.

1. Law of Leadership: It’s better to be first than better.

2. Law of Category: Create a new category to be first in.

3. Law of the Mind: It’s better to be first in the mind than in the marketplace.

4. Law of Perception: Marketing is about perception, not products.

5. Law of Focus: Own a word in the prospect’s mind.

6. Law of Exclusivity: Two companies can’t own the same word.

7. Law of the Ladder: The strategy depends on your rung in the market.

8. Law of Duality: Long-term, every market becomes a two-horse race.

9. Law of Opposites: Leverage your competitor’s position to differentiate.

10. Law of Division: Categories eventually split into niches.
    … (and 12 more laws covering candor, singularity, resources, and more).