QWERTY is the most common modern-day keyboard layout.
It has variants depending on countries: AZERTY in French, QWERTZ in German, etc.
Originally, it was designed to avoid mechanical collisions of typewriter hammers when typing fast, hence the strange layout.
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You don't have to carry your own keyboard everywhere, QWERTY is pretty popular
Vim is most natural in QWERTY, since this is the layout it was designed on. Learning a good editor will help with your programming a lot more than learning a new layout.
Pro Default keyboard shortcuts
The keyboard shortcuts for most applications were designed with QWERTY in mind.
Con Made for typewriters, not computers
It was created before computers get popular.
this layout was created for typing machines, to prevent collision between character hammers and slowing down the typist.