What drill do you use to drill metal?
Not all metals are alike. Copper is different from aluminum and gold is different from iron. In addition to 'pure' metals, there are also dozens of blends or alloys such as copper, bronze, and stainless steel. The hardness and malleability determine the way to drill metal. We can say that for metals in and around your home and garden (aluminum, steel, stainless steel/inox) the method is practically the same. As is the case with drilling wood, stone, and concrete it's just a matter of choosing the right machine. Put the right drill bit on it and the job will be easy as pie.
The right drill bit
Almost all drills are suitable, but that's certainly not the case for all drill bits. Wood, stone, and concrete drill bits have a different composition and specifically a different point. In the case of a metal drill bit, the point is sharp so that it penetrates the material effectively after just a few rotations. If it wasn't sharp, the drill bit would slip and damage the material. In addition, metal drill bits have cylindrical shafts that guide away shavings (the drilled out bits of metal). Because of that, you don't have to pull out the drill like you do when drilling wood or stone.
Drilling metal is a precise job that requires some expertise. Still, it's also a job that everyone can learn.