https://youtu.be/j23S2bZPt2A Firaxis has today released a new short, talking about yields and improvements. Civ7 does not have anymore worker units, so you do not improve tiles as in previous civ games. Instead, if you work a tile, it automatically gets improved. If you want to change the yield of an improvement, then you need to build a building with an associated modifier. Want to discuss this? Then join us here: https://forums.civfanatics.com/threads/yields-and-improvements-short-video.694518/