Hydroponics : A place to produce crops (for cooking and herbal production). (Bulk production, place seeds or small samples and later the hydroponic multiply and add more units after some time)
Factory : To produce eletronic parts (Production in a bulk, place metal and organics, take the eletronic parts)
Refinery : To melt ore and produce bars (Production in a bulk, place ore, return later to take the bars)
Watch tower : Place guard droids to protect an area around the land, if attack the tower or other buildings.
Turret : To keep simple, something to shoot against someone if try to attack the control tower or other buildings
Store : Looks like a small bulding with an inner part, with a npc droid selling the products of the owner to others pcs.
Training grounds : A kind of inner arena, with combat droids for training. They do not give xp, but can be configured for physical combat or firing weapons. It is used for employee and owner training
Landing area : For construction, repair or landing and takeoff of ships. But in pratical terms, It can be used to dispatch materials and products to the colony without necessarily being forced to travel directly to the colony to sell your materials or products. It’s all placed in a cargo container for be take later, being deposited into credits in the owner’s account.