Let me try to answer that.
Most of the keyboards these days have a special arrangement of keys called QWERTY arrangement. Note that QWERTY contains first five keys of the top row.
This special arrangement is popular because it makes it easier to type words. For example, letter 'e' & 'r' are most commonly used, so they appear next to each other.
It's very easy to remember the QWERTY layout. I hope this helps in satisfying the curiosity. More replies are always welcome
-The Big K-