Essentially you are going to run into two basic types of screwdrivers. There is the “Standard” or slot screwdriver which is the most common form. It is often used as a prying tool, and sometimes as a chisel when needed. There is also what’s known as the “Phillips” screwdriver. That is the type of screwdriver that has an “X” shape bit on the end.
This isn’t going to take a genius to figure out, but don’t use a standard screwdriver with a Phillips screw. I see that so often it hurts. You can end up damaging the screw and hurting yourself in the process if your hand should happen to slip. Use the right screwdriver for the right job. This also means using the screwdriver with the correct size head for the fastener that you are working with. This is why I always suggest that you buy screwdrivers in sets. My preferred brand is Klein. They are built well and if you lose a driver down the road, you can get a new one that is the same style as your older driver’s which is nice if you are trying to keep a uniformed set.
Screwdriver’s shafts vary in length and width as well. This is just another reason to buy screwdrivers in sets. Longer shafts can be greater for buried fasteners while a stubby screwdriver is great to tight fitting, close quarters work. The last piece of advice is that if you don’t get the Klein screwdriver’s to make sure that you find a set that has a comfortable grip. Never get a screwdriver that has a foam handle, those not only fall apart in days but don’t provide any insulation from shock. You should look for something with a rubber or rubberized grip. They are typically durable and provide some degree of shock insulation.