You need a passport and a pass to go to Hong Kong. Passports are handled at the public security bureau where the household registration is located, and so are Hong Kong and Macao passes. Passports are divided into L-sign and G-sign, and L-sign is required for customs clearance. You need to find a travel agency or someone at the gate to do it. Generally speaking, the customs clearance fee at Huanggang and Luohu ports is 50 yuan, the customs clearance fee at Shekou by boat to Hong Kong is 60 yuan, and the ticket is 200 yuan. There are Yantian Port and Futian Port.
If you want to go to Hong Kong, you must go to Disney and Ocean Park, then you can visit the new wing of Hong Kong Convention and Exhibition Center and Golden Bauhinia Square, the newly-built "Avenue of Stars" along the Tsim Sha Tsui waterfront promenade, the temples with the most incense in Hong Kong, Wong Tai Sin, Taiping Mountain and Madame Tussauds, and take a sightseeing boat to visit Victoria Harbour. I hope it can be adopted!