There is  an unwritten law that says, “You never have enough clamps.” But, if you choose your clamping tools carefully, you can get a lot of versatility out of relatively few clamps.
 
Hand Screws - The woodworker’s most useful clamps are Hand Screws. Their wooden jaws can be moved in either a parallel or non-parallel action by tightening both screws in unison or one screw more than the other. They won’t mar project surfaces while their double screws and deep throats allow you to grasp a variety of odd shapes.
 
Double Bar Clamps - Wide panel glue-ups are made much easier by using Double Bar Clamps, a unique, two-way clamping system that holds your workpieces perfectly flat while it squeezes them together.
 
Cam Clamps are light in weight, yet can also exert up to 300 pounds of pressure. The larger sizes offer throat depths that exceed most bar-type clamps . . . a real advantage when you need the added reach for certain types of glue-ups.
 
3-Way Edge Clamps are ideal for gluing veneer tape or solid hardwood edges onto plywood shelves, etc. They’re very inexpensive and will save you a great deal of time when performing this specialized operation.
 
 
Some tips on clamping:

• To make sure all joints fit properly, dry-clamp all components before gluing.
• Mark all workpieces carefully before clamping and gluing for accurate assembly.
• Use a Double Bar Clamp or alternate Aluminum Bar Clamps (one above and one below) when gluing edge-to-edge to prevent buckling.
• Use small pieces of scrapwood as protectors to avoid marring workpiece surfaces.
• Small rubber bands, clothespins, and stationary binder clips make great clamps for many different jobs.
• Always maintain a liberal coat of linseed oil on hand screws to prevent glue build-up on the jaw