Hello,
I am still quite new and learning slowly. I think it would be helpful if when learning one skill and you click another skill it gives you a pop up to warn you that it will stop the current learning session as well as you can only learn one skill at a time. I had clicked on three skills simply because the program allowed me to, and then the game was closed. When the game reopened I had three paused skills and had to ask my more experienced fiance what it was about.