There are many website that tout online typing lessons, ranging from simplistic key prodding pages to exotic game sites that have little to do with actually typing. Most are either obvious such as "type this exercise a thousand times and you will eventually learn something"; or simply a gilded wrapper for selling exorbitantly priced software.
Follow with home row exercises.
Practice the typing lessons and become an expert typist!
It can really just be that simple, practice makes perfect and with a free resource online - all you need is an Internet connected computer with a keyboard. QWERTY, AZERTY and DVORAK keyboard lessons are all available on the site.
Creating a user login on Learn 2 Type's site is recommended, so scores and peformance evaluations can be saved. Once a typing expert, you may purchase a typing speed certification (its optional, and the only thing that a small fee is charged for).