2. Food waste
If you are not sure which one is food waste or not, just think about animal. If animal can eat something, it is food waste.
Normally, there is food waste bin in Apartment, but in case of house, you should buy paper bag for food waste.
There are 5 kinds of paper bags for food waste (1ℓ, 2ℓ, 3ℓ, 5ℓ, 10ℓ).it would be better for you buy 1~2ℓ, and throw it away frequently.
3. Common garbage
Common garbage is all garbages exclusive of recycle and food waste.
You should buy a standard plastic garbage bag(종량제, jongnyangje) from supermarket.
There are 4 kinds of plastic garbage bag(10ℓ, 20ℓ, 50ℓ, 100ℓ). If you are single household, 10ℓ would be the best.