A space navy must carry its support system

What lesson from historical navies should architects of a future space navy heed?

Logistics: take the supplies and support capacity with the fleet, because distant operations cannot assume that a missing item will be available when needed.

A force operating far from dependable bases must carry the equipment, stores, and support capacity it may need. Missing supplies cannot be assumed to exist at the destination. That requirement pushes ships upward in size. Endurance and logistics become structural design problems rather than afterthoughts.