What are the most important features to have on spaceship?

The most important features of a spaceship include advanced life support systems to ensure crew survival, reliable propulsion systems for maneuverability and travel, and robust navigation and communication technology for safe operation and coordination. Additionally, structural integrity and shielding are crucial to protect against space hazards like radiation and micrometeoroids. Lastly, modular design can enhance adaptability for various missions and facilitate repairs or upgrades.