Biography
Here is where you can describe your training or anything you believe will assist in telling the public about you as an artist. It can include your resume (or only be your resume). You can make it as short or as long as you feel is neccessary.
Statement
Here's where you describe your approach to your work. How you create your work, what it means to you and who or what has influenced your work. Again, this can be as short or as long as you feel is neccessary.
Keep in mind, however, that brevity is often better since many people dislike reading long passages online.
Some people like to only show their bio, others only their statement. It's entirely up to you. What's important is that you use this page to communicate with the public and tell them what sets you apart as an artist.