Placement Flags (required 1, 2, or 3)
1. "placeable-player"
2. "placeable-neutral"
3. "placeable-enemy"
4. "placeable-off-grid" (optional)

Game Interaction Flags (optional 5+)
5. "pushable"
6. "player-creation"
7. "breaths-air"
8. "not-repairable"
9. "building-direction-8-way" (not relieable)
10. "filter-directions"
11. "fast-replaceable-no-rotate-only"

Ex: placeable-player (Do Not Add Quotes!)

Codeing Ex: flags = {"placeable-player", "player-creation"}

Go To https://wiki.factorio.com/index.php?title=Types/EntityPrototypeFlags for more info!