Visual Basic is a kind of 'basic' language which was invented by Microsoft. Most Microsoft products support VB, VBA, or VBScript.

Example
I wrote a simple currency converter for a fresh student by using VB6. (download code and exe files)

Beginners
Gary Beene's Visual Basic Information Center http://www.vbinformation.com/

Intermediate
About dot Com http://visualbasic.about.com/compute/visualbasic/mbody.htm

Experts
Advanced Visual Basic http://vbwire.com/advanced/
The goal is to keep the content of these pages aimed at the experienced Visual Basic developer and touch on topics found nowhere else on the Web.
Anthony's VBA for Excel http://www.geocities.com/WallStreet/9245/
The objective of these examples is to show the power of VBA for Excel and to provide some information which will be useful to people who are interested in VBA for Excel. 

All Levels
Carl & Gary's VB Site http://www.cgvb.com/
'Your site has always been #1 on my favorites list.'