There are many websites that have keyboard typing lessons and information for free. One of the most popular websites is Typing.com, which walks users through which fingers to use on each key, without much reading required.
One of the easiest typing exercises to jump into without any prerequisites is Keybr. Keybr has an easy pick-up typing interface that guides the user to where the letters are located, using a graphic of a keyboard. Keybr also keeps track of statistics and progress. Another popular online resource to learn to type is Big Brown Bear Software. This Flash-based exercise helps improve typing skills, concentrating most on accuracy.