How to properly design a table?

Question

PostgreSQL

There is a one-to-many relationship and therefore decided to move the field to a separate table. The field
itself will be of one type (varchar(20) with unique values) and there will be several dozen records in this table. Do I need to create an additional field such as id, make it PRIMARY KEY and be referenced by another table? Or is it better to leave the table with one field and directly refer to type?

Answer 1

If we put it in a separate table, then there must be a surrogate PK.
If PK is not added, then there is no point in moving this field to a separate table.
PS I wouldn't put it in a separate table at all, so as not to make unnecessary connections in the future.