In this section, we will start linking different parts together in an assembly using the non-value-oriented standard mates. We will learn about the coincident, parallel, perpendicular, tangent, concentric, and lock mates. These mates don't need a numerical value input to be applied to them; instead, they are constructed based on their relationship with different geometrical elements. In this section, we will learn what those mates are and how to apply them. We will also cover the different levels of defining an assembly. We will start by defining each of those non-value-oriented standard mates.