Correct spelling


Correct spelling, explanation: in cases when a word ends with consonant-vowel-consonant we, in most cases, double the last consonant when adding -ing or -ed ending. This is why the correct gerund form of put is putting, not puting.

Definition of putting:
verb, gerund of put, to set or place something somewhere
It’s very rainy today; putting on a raincoat is a good idea.
Please stop putting your feet on the table!

Incorrect spelling


Incorrect spelling, explanation: verbs that end with the combination consonant-vowel-consonant double their last consonant in cases of adding -ed or -ing form to them. Some examples of this are: robrobbed, sitsitting. The same applies to put, so the correct form here is putting and not puting.