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Jigsaws have been around for many years and have not changed significantly in that time. The principal of how they work is the same, the blades move up and down at a high rate of speed as the saw is pushed into the wood and thus a cut is made ... pretty easy eh? .... Well, not so fast. There are a few things that we can all learn about jigsaws that can make them far more useful.
First of all, there are 2 basic jigsaw blades available. The newest version is called a "T" connection, the older one is often called a "U" connection because at the very top of the blade there is a tiny "U" cutaway. As usual, the blades are not interchangeable. The quick way to tell (in most cases) if you jigsaw has some sort of a screw at the point where the blade enters the mounting slot in the saw, it is likely the older type, the "U" connection. If your jigsaw has some sort of twisting lever, it's likely a "T" connection type blade required.
The newer jigsaws now have variable speed motors, and locking switches so that if you are making a long cut, you can not only adjust the speed accordingly, you can also lock the motor on rather than trying to hold the on switch for the entire cut. What about blades you ask ... well ...