Difference between white & green vs single green? White & level vs single yellow?

https://preview.redd.it/7702wlghoykh1.png?width=933&format=png&auto=webp&s=7d9471711c30711bd5087df608c2026c6fea7932 Lowkey, please explain it to me like I'm 5. TIA yellow* [link]