I've started to learn touch typing many times, but don't use it. The main problem is that as soon as I want to touch type while working (e.g. coding), I only know the letters, but not the symbols, numbers or even uppercase letters. I think I can force keybr to add those, but they are not part of real world examples, while the words are natural enough. Is there any progressive way to introduce those just like keybr introduces 1 letter at a time ?