A good Stronghold is a resource pipeline that makes the next expedition safer, not just a decorative build.
Build the useful loop first
Storage, a Farm, Crafting Stations and production functions are the practical base layer. Farming plots, Seeds, growth and Harvest can support the food and recovery pipeline instead of making every consumable an exploration emergency.
NPC investment is part of the base
NPCs are not only dialogue markers. Recruitment, shops, facilities, crafting functions, stock and farming support can all belong to the Stronghold investment layer; exact requirements remain an EA verification queue.
World progress does not travel
Buildings, settlement layout, recruited allies and Story Progress stay with the host's World. Level, Equipment, Inventory, Spells and Personal Progression are the character-side records that travel with the player.
Protect shared materials
Gear, buildings, food, potions, Spellbooks and NPC progress can compete for the same resource pool. Use the Materials and Crafting pages together before selling a material that has several Demo-era uses.