Are you refereeing to folders inside Tableau Desktop?
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As such there are no best practices. However, I group relevant fields in the data pane in one folder. For example, I have start date, end date and so on, so, I will create a folder let's say Date and add these fields in that. If I have system generated fields like audit id, updated date, modified date, and so on, I create a folder System fields and put these fields there. I combine all geographic fields in a folder called Location. Similar method I follow for measures as well. If I have measures like upper limit and lower limit, I combine the in a folder called Threshold value. I also create separate folders for calculated fields.
Hope this gives you some idea.