Some general questions that I often hear from people.

Can't I just exercise a fat part of my body to make the fat go away? Can I just do a bunch of sit-ups to make my gut go away?

No. So-called "spot reduction" is a myth. (link to source) You can't exercise one part of your body to make fat in that part of the body go away; it doesn't work that way. You can only reduce your overall body fat, not make it go away in a specific area. Picture a bucket with a hole in the bottom - the water will drain equally from all sides; it's up to you to create the "hole".

I want to get abs, what workout should I do?

As the old saying goes, "Abs are made in the kitchen, not in the gym." Having visible abs has very little to do with doing abdominal exercises, and a whole lot to do with how much body fat you have. If your abs are covered in a layer of fat, any ab exercises you do are made virtually pointless. And ab exercises won't make fat over your belly go away, either (see the spot reduction myth above). To get visible abs, you need to get your body fat down with diet and exercise. Abs generally becomes visible at around 12% body fat, though it varies from person to person. Although abdominal exercises rarely make a difference in how you look, they can be beneficial for other reasons. If you do ab exercises, do them holding a heavy plate and in the 5-10 repetition range.

It's important to be aware of this before starting a lot of people don't know about this and get discouraged early on.