Going to Hong Kong with L visa. What is the difference between "L" and "G" visa?

The G visa is an "individual travel visa", which has city restrictions. You can enter and exit freely from Hong Kong directly without leaving the country with a group. Only designated residents in China can apply for G visa to go to Hong Kong

L visa is a "group travel visa", which is required to travel out of the country in a group, but must be transferred from Shenzhen or Zhuhai to Hong Kong.