Minecraft wiki entry for Drowned_farming, associated text: 1 Mechanics
1.1 Flooded dungeon
1.2 Aerial
1.3 Underwater
2 Survival-mode build: Flooded dungeon
2.1 Location
2.2 Preparation
2.3 Construction
2.3.1 Prepare the dungeon
2.3.2 Prepare the trap
2.3.3 Start the farm
2.4 Operation
2.5 Iron and gold farming
3 Survival mode build: Aerial platform
3.1 Components
3.2 Preparation
3.3 Building from the bottom up
3.4 Operation
3.5 Improvements
4 Complex variations
4.1 Fancier variations
5 YouTube examples
5.1 Java Edition
5.2 Bedrock Edition