What is the difference between editing for spelling and punctuation
and editing for style?

Editing for spelling and punctuation means correcting the text for spelling, grammar and textual conventions (bold and italics, etc.). Meanwhile, editing for style also consists of changing the text to make it more cohesive, coherent and suitable for its purpose (that means, when I edit in this way I make suggestions about changing the order or punctuation of words or sentences, shortening or lengthening paragraphs, etc.). When you send me a text to correct, before giving you the quote I will ask which of the two types of correction you require.