What part do I mention overstay in the application? Can I put DACA instead because it’s the same thing?
You're actually asking a very good question. I checked the study permit application form and could not find any relevant questions with regards to overstaying your status in any other country (question 2 IMM1294E).
I remember when I myself applied for study permit all those years ago, there was a question on whether or not I had been resident of any country for over 180 days within the past five years (in this case, you would have to check 'yes', and they may ask to question you further).
That would be the place where you would have to disclose any past immigration infraction with them, maybe during interview.
I don't see the question anymore in the current application form. It looks to me that you can really get away with checking 'No' for all the boxes, and still do not commit any misrepresentation.
Most likely though, from your education or employment history, they would come to know that you were in the US for some number of years, and when they checked your passport, they would not be able to find any US visa.
They will likely want to interview you before granting you the visa, and you would have to tell them the truth.