Create assembly drawing in solidworks

What is assembly?

assembly is comprised of one or more SolidWorks Parts or Assemblies, and is used to model relationships between these subcomponents or subassemblies using relationships called Mates.

How many mates in solidworks?

The purpose of mate is to create a mechanism or model that made from at least 2 parts. 
mates in solidworks are in 3 categories: standard mates, mechanical mates and advanced mates. 
to use mate you should go to assembly mode. select the parts you wanna to mate them and select a logical mate from mate icon in assembly tool bar or from inset> mate. 

What is mate?

Mates create geometric relationships between assembly components. As you add mates, you define the allowable directions of linear or rotational motion of the components. You can move a component within its degrees of freedom, visualizing the assembly's behavior.

Some examples include:

• A coincident mate forces two planar faces to become coplanar. The faces can move along one another, but cannot be pulled apart.
• A concentric mate forces two cylindrical faces to become concentric. The faces can move along the common axis, but cannot be moved away from this axis.

Mates are solved together as a system. The order in which you add mates does not matter; all mates are solved at the same time. You can suppress mates just as you can suppress features.

I have some video to discribe assembly in solidworks with 3 type of mates

#exercise 1 standart mates

please click this link to watch standart video
standart mate

#exercise 2 assembly trick

please click this link to watch assembly trick
assembly trick