I am not too familiar with the classification of errors in English.
Of course, I know ‘grammar’, ‘punctuation’ and ‘spelling’ mistakes - generally,
but sometimes, doing exersise, I am begining to have my doubts about my general understanding of the classification.
One of those specific cases is with upper-lower letters.
english, mr. Colin, i, etc - what class/type/kind of mistakes is it in English?