Touch typing means typing without looking at the keyboard. Each finger looks after a few keys and finds them by feel. It is slower at first, then much faster, and far less tiring than hunting for every key with your eyes.
1. Start from the home row
Rest your fingers on the middle row of letters: left hand on A S D F, right hand on J K L ;. The small bumps on F and J let you find this position without looking. After each key, your finger comes back here.
2. Learn a few keys at a time
Do not try to learn the whole keyboard at once. Start with the home row, then add two keys at a time: the course on Typocto does exactly that, with a keyboard on screen that shows which finger to use.
3. Accuracy first, speed later
Type slowly enough to hit the right key almost every time: aim for 95% accuracy or more. Speed comes by itself once the movements are automatic; mistakes, on the other hand, become habits too.
4. Do not look down
When you are unsure where a key is, look at the keyboard on the screen, not at your hands. That is the habit that makes all the difference.
5. Practise a little, often
Ten to fifteen minutes a day work better than one long session a week. Most people know every key after two to four weeks, and keep getting faster for months.