Explore the fundamentals of technical communication for open-source projects in this EuroPython Conference talk. Learn how to improve documentation for better user onboarding, code contribution workflows, and overall project accessibility. Discover key principles including tone, style, process management, structure, and contribution workflows. Gain insights into content strategy, understanding user needs, error message crafting, and community engagement. Examine the evolution of documentation practices, the importance of a unified tool chain, continuous integration for docs, and strategies for content curation. Understand when to consider hiring a dedicated technical writer and how to foster a documentation-centric culture within your project.