Which teeth do you put brackets on for braces?

I am a 15 year-old teenager and I wear braces. This to me, seems like a silly question, but I don't mean anything by it. Brackets are applied to every tooth in the mouth. First, the orthodontist carefully puts every bracket on the teeth, individually of course, and then glues them in place with this unique cement-like substance. Don't taste this whatever you do as it leaves a bitter aftertaste. Then he or she will use this plasma light to activate the glue, and then presto. They are securely fastened. Afterwards the arch wire is put on.