SQL: Holding Multiple Values in One Row

[EverFrost]

Hello teachers. Hello. The question is simple but I couldn't solve it or I couldn't figure out how to do it. When adding data to a table, for example, the category of the product needs to be added, and in some cases, more than one category needs to be added to a product (I am getting the ids of the categories in the meantime). I couldn't figure out in which data type I should set this in the table and what kind of query to write when adding it. Help please