As far as I am aware, the sentence should be,
"The quick brown fox jumps over the lazy dog"
and not
"The quick brown fox jumped over the lazy dog"
The difference is that in the first sentence there is the letter 's' whereas in the incorrect sentence there is no letter 's' at all.
Regarding learning to touch type. I didn't learn to type till I went to university in my mid 20s, and found that I couldn't even read my own handwriting. So I bought myself a small travel typewriter and learned on that, till a friend of mine let me borrow her IBM golfball electric typewriter. She then told me about the sentence above and showed me where the home keys were, so that I could practice. This I did religiously till I could literally write my sentences by looking at the paper rather than at the keyboard.
Because of this I was able to type quite quickly after a while, and although I now make more mistakes than I used to thanks to old age, I still look at the screen rather than the keyboard when typing.