In his keynote talk titled "How to Dominate the World" at the Paris.rb Conf 2020, Yukihiro "Matz" Matsumoto explores the factors behind the success of the Ruby programming language. He reflects on Ruby's evolution, its significance in the software development community, and the lessons that can be learned for software development in general.

Key points covered in the talk include:

- Background on Ruby: Matz shares how Ruby was created in the early 90s amidst Japan's economic depression. Initially, it was a little-known scripting language until it gained popularity through frameworks like Rails. Today, Ruby is recognized among the top programming languages.

- Motivation: The core of Ruby's development was pure motivation. Matz emphasizes that genuine passion can drive the creation of a programming language and lead to long-term success.

- Defining Target Audience: Matz created Ruby primarily for himself, which emphasizes the importance of having a clear target audience for software projects. A focused audience can lead to better engagement and success.

- Community Impact: Matz underscores the critical role of community in open-source projects. Ruby’s inclusive community approach encourages participation and collaboration, which has been essential to its success.

- Software Philosophy: He discusses the philosophy of simplicity in Ruby, which has made it accessible to many developers compared to more complex alternatives. This simplicity fosters engagement and community growth.

- Guiding Principles: Establishing clear goals and community guidelines can unify efforts. Matz refers to Ruby 3’s goals for better performance and concurrency as a clear direction for future development.

- Commitment to Improvement: Matz highlights the necessity of a long-term commitment to software development and the community’s needs. He emphasizes the importance of adapting to changes and focusing on improvement to ensure sustained success.

In conclusion, Matz encourages a collective effort in the software community to continue innovating and improving technologies. His message conveys that with motivation, a clear target audience, and a supportive community, software projects can thrive and potentially "dominate the world". He emphasizes that Ruby will continue evolving, focusing on enhancing performance and maintaining backward compatibility with upcoming releases.