Hello:
There are many ancillary industries in the catering industry, and the industry chain is also very long. Some require technical content, and some do not.
From what you said, it seems that you do not need to be highly technical.
The main business that does not require high technical content is buying and selling, such as: wine, beverages, promotional material printing, tableware purchasing, kitchen equipment purchasing, kitchen seasoning purchasing, kitchen consumable dish purchasing, kitchen seasoning purchasing, kitchen Purchasing sanitary products, purchasing work clothes, etc.
There are also many businesses that require technical content, such as recipe making, staff recruitment, chef training, etc., ordering services, cleaning tableware... too many.
If you really want to do a good job making money, just get fuel. This thing is relatively good. Not every household can use piped gas, which is too expensive. The main reason is that the technical content of fuel is not very high, and the price is somewhat profitable, but it is still profitable.