As much as I want. The key is understanding accounting as well as FoxPro. Otherwise, you can get requests to do shady things and do them because you don't know any better.
Know what? The IRS doesn't care if you didn't know it was wrong -- you can still end up in jail. Also realize that businesses rely heavily on their accounting systems. Making a mistake in this field is akin to making mistakes in surgery.
Other that that, it's pretty good. Although SBT doesn't exactly tax the limits of VFP -- at least not in its present forms. More like FoxPro Windows and a smidge.
- John