What are the subdivisions of dog chains and which ones are suitable for novices?

Fixed collar, P-type chain, chest back chain and barbed nail collar.

The P-type chain is generally used as a professional. The spikes have been eliminated due to damage to the animals. 

Commonly used collars are mainly fixed collars and chest back chains. 

The choice should be considered for dog collars rather than for people, so no matter novices and novices. In addition, novices do not recommend the use of excessively long leashes, in order to control the dog in a small range.