About Turkish letters
Turkish has two i letters: dotted i/İ and dotless ı/I. They are different letters, so uppercase i is İ, not I.
The Turkish Q layout keeps QWERTY and adds ç, ğ, ı, ö, ş, ü on the right; the Turkish F layout is a different arrangement designed for Turkish.
On a Mac, Option+U then the vowel gives ö and ü; ğ, ş and ı need the Turkish layout or press-and-hold.
Turkish letters: names and codes
Every special letter in Turkish, with the Windows Alt code where one exists, the hex code to type in Word followed by Alt+X, the Mac shortcut and the HTML entity. Click a letter to copy it.