Payment

The most common payment methods are T.T and LC. If cusotmers pay cash, it is fine. 

L.C needs special attention. LC terms are closed linked to trade terms and documentation.In China many banks are qualified to open or accept L.C. 

L.C is commonly used in sea-freight cargos. 

Ports
After cargos are trucked from suppliers' warehouses, there are many different fees generated in ports. 

So read your bills carefully in case of unnecssary charges. 

In Guangzhou there are 2 main cargo ports, namely Huangpu port, Nansha port.

In Shenzhen there are 10 main cargo ports, namely Shekou, Yantian, Chiwan, Mawan, Dachan,etc. 
Shekou and Yantian ports are used the most for international cargos.

Containers
There are many types of containers, 3 of which are the most common.

FCL 20" (Volume: 33.2 cbm): It has dimension 5.89m x 2.35m x 2.39m and maximum weight 24 tons. The actual cargo gross weight is 18 tons.

FCL 40" (Volume: 67.7 cbm): It has dimension 12.03m x 2.35m x 2.39m and maximum weight 30.48 tons. The normal cargo gross weight is 26 tons.

FCL 40" HQ (Volume: 76.3 cbm): It has dimension 12.03m x 2.35m x 2.69m and maximum weight 30.48 tons. The actual cargo gross weight is 26 tons.

In a real world, it can barely load the same volume. Based on my experience in calculating the loading volumes, here are two tips that I have for you; if the packaging volumes are lower than 0.02m³/ctn, then the actual loading volumes are:

FCL 20" (Volume: 28 cbm)

FCL 40" (Volume: 56 cbm)

FCL 40" HQ (Volume: 68 cbm)

If the packaging volumes are more than 0.04m³/ctn then the actual loading volumes are:

FCL 20" (Volume: 24-25 cbm)

FCL 40" (Volume: 53-54 cbm)

FCL 40" HQ (Volume: 63-65 cbm)
During rush season you need book containers in advance in China in case of container shortages.