## Table of Contents * [Best Practices](#best-practices) * [bll](#bll) * [dal](#dal) ## Best Practices Two main folders hold the methods used to interact with the database: `bll` and `dll`. ### bll `bll` is for *Business Layer Logic*. Methods here are for interacting with _multiple_ collections (or tables). There is some sort of business logic that will govern joining collections (or tables). ### dal `dal` is for methods interacting with _single_ collections (or tables).