As you rank up, you get the option to take additional Crafts, or gain a Fluency in a Craft you already have. A Fluency is a more tailored form of the Craft it corresponds to. For instance, you could be a historian with a Fluency in ancient Shaloban history, a tailor with a Fluency in wizard robes, or an enforcer with a Fluency in intimidating homeless people. When you make a Craft Check where your Fluency is relevant, you add two times your proficiency to the roll (your fluency bonus). The GM may also tailor the results with regards to your Fluency.
The levels at which characters gain Crafts and Fluencies are shown highlighted in the table below.