Question

why keyboards has QWERTY Buttons instead of ABCDEF buttons​

Answer 1

The reason is when it was first invented, they had keys arranged in an alphabetical order, until configuration was desired over convention. Most people were taught that the man who invented the keyboard created the QWERTY design to slow typists down because the faster someone typed, the more often the typewriter jammed

Answer 2

The reason dates back to the time of manual typewriters. When first invented , they had keys arranged in an alphabetical order, but people typed so fast that the mechanical character arms got tangled up. So the keys were randomly positioned to actually slow down typing and prevent key jams.