To achieve first normal form for a database, you need to make sure that no table contains multiple columns that you could use to get the same information. Each table should be organized into rows, and each row should have a primary key that distinguishes it as unique. The primary key is usually a single column, but sometimes more than one column can be combined to create a single primary key.
Using the rules of first normal form, there may be redundant information across multiple rows, but each row will be unique.