A saw blade is a critical part of any woodworking tool. They’re used for a variety of purposes, so it’s important to know what each is for and their benefits.
Saw Blades 
A saw blade is a cutting tool that cuts wood, metals, and plastic. Its teeth and blade plate can be configured in a variety of ways, depending on the specific type of cut you need to make. The width of the “kerf” – the slot in the material a saw blade cuts – is an important consideration. Thin kerf blades use less power and are more cost effective on cordless tools, jobsites with under-powered generators, and other situations where you might need a small, narrow kerf for efficient cut results.
Circular Saw
A circular saw is a handy tool that can be used to cut many different materials, including wood, metal, and plastic. It can make straight cuts, crosscuts and rip cuts. This saw can also be a good choice for making beveled cuts, which are perfect for finishing off your projects. However, it is essential to know how to use it safely and accurately.
Straight Saw
A straight saw is a type of blade used to make clean cuts. Bushcrafters often use a straight saw when building shelters and traps, making precise pruning cuts in tight spaces and for other detailed work. So, if you need to reach between the hips and the head height region, then a straight blade will do the job best.
Dado Set
A dado set is a blade that is used on table saws to cut a wider groove in material (usually wood) than a traditional saw blade would. Some of these sets have multiple blades assembled together (stacked dado set) and some of them even have a wobble to it that sways a little bit from left to right (hence the name “wobble”). Stacked dado sets are ideal for cutting rabbets, dados, T-slots, half laps and tongue and groove joints for strong mortise-and-tenon joinery. They’re also incredibly easy to use and set up.
Combination Blades 
A combination blade is a circular saw blade that performs both ripping (cutting with the grain) and crosscutting. These blades are best for woodworkers who make a variety of cuts, such as cutting hardwoods, softwoods and plywood. Combination saw blades consist of sets of five teeth (4 Alternate Top Bevel, or ATB, teeth and a raker tooth, called a ranker, because it is squared on top). These are typically separated by a large gullet to help with chip removal when ripping.