Just about every good carpenter and hobby wood-worker needs a solid, reliable circular saw in their tool collection.  The amazing overall flexibility of the circular saw makes it possible for it to execute an astonishing variety of chores, which makes it amongst the more popular tools around most wood-working shops.  The capacity to adapt the depth and angle of your cut opens up the door to a variety of possibilities. 
  
 The first thing, you will need to determine, is what type of circular saw you want.  You have only two possible choices to choose from: in-line saws and worm-drive saws.  In-line saws are the most commonly seen selection for the usual DIY'er.  They have a lot of flexibility in a small, lightweight and safe package.  On the other end of the spectrum, are worm-drive circular saws, which are actually best left to the professional carpenters.  They've got the motor secured next to the blade, which delivers considerably more torque to the blade.  This permits them to cut through rugged elements like concrete, however they are a great deal more dangerous as a result of the increased torque.  Read a lot more info on this here: 
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 For normal DIY and hobby projects, an in-line (or sidewinder) saw is a good option.  Even though in-line saws create less power than a worm-drive saw, most in-line saws have no issue managing almost any task you could give it, short of huge industrial construction.  Moreover, they are lighter, easier to use and safe.  Also, make sure the circular saw you pick out comes with an electronic brake.  This feature induces the flow of electricity to be reversed whenever you release the trigger, forcing the blade to stop rapidly.  This is an important and practical safety feature. 
 
 If transportability is important to you, you will want to consider a cordless circular saw.  This will allow you to use them almost anywhere, without the need for a generator and long extension cords.  There are a couple of drawbacks to portable circular saws: they have less torque, and you are constrained by the runtime of the battery pack .  You can buy additional batteries to prolong the run time, however make sure you remember to make sure they are fully charged, which may be annoying.
 
 Be sure to think of the type of work you are likely to be carrying out before purchasing any type of power tool.  This is especially correct with circular saws.  If you need to change blades often, purchasing one with a quick-change feature could save you loads of time down the road.  If you'd like deep cuts, you will want a saw with a blade capacity big enough to meet your needs.  Additionally, make sure to look at a few circular saw reviews prior to you making your purchase to be sure you purchase the best circular saw possible.
 
 Like I said at the beginning, every carpenter and DIY'er needs a durable, dependable circular saw in their tool collection.  The amazing flexibility of the circular saw allows it to perform an astonishing variety of things, which makes it amongst the most popular tools around most woodworking shops.  The option to adapt the depth and angle of your cut opens up the door to an amazing amount of possibilities.