For basic training and understanding GIS:
There are several on-line classes that are free to the UH-Manoa students, faculty and staff.
Visit the UH-Manoa's ESRI's Virtual Campus Courses Page on more information on these classes
To enroll, create an ESRI login here.
Then to access courses and request a password for specific courses, please contact the University's License Administrator via e-mail:
sladmin at hawaii dot edu
Please note that these classes are offered by ESRI, a major GIS software company. There are other GIS software providers. Open source GIS software is also available.