When you work in fields that are always changing, sometimes it is important for you to have to go back and take classes to keep up. Computers are a field that you will find yourself always having to keep up with. Classes are always available for you to take.
Sometimes you will be offered a promotion if you go back to school and take a few classes. In order to make more money, you can go back and get your degree, or just brush up on some basics. These are usually easy to do and can be done while working full time.
Always keep in mind that not all careers will offer this to you. While some will require some sort of college education starting off, not all even need it. Although it is no secret that you will be able to get a better paying job most of the time if you have a college education, you may not always find it to be necessary.
Ask your boss if you can further your career by taking a few online classes or taking a few tests. You will be surprised how many opportunities will become available to you once you do this.
Whenever you are applying for a job, always see if there is room for advancements. A lot of the time, you will find that you will be offered more money if you further your education in the field that you work in. It is always a good idea to ask before you take classes though, as they may be unnecessary.