Use this kind of grammatical structure to describe two things that happen at the same time. It's most commonly used for two continuing processes that happen together:
As you get older, you learn what your own strengths and limitations are.
"As ___, ___" is good for describing how things work. Here's a technical description of how water boils:
As the temperature of the water rises, some of the water molecules begin to go into a gaseous state.
You can also give formal instructions using "As ____, ____":
As you leave the auditorium, please pick up one of the yellow brochures from the table by the exit.
As you begin your job search, keep in mind that there are a lot of opportunities out there; you don't have to take the first job that you're offered.