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.