Best file formats · Poster Print on Demand

Best file formats

Hi, I’m brand new to this game and have been making posters on Canva using custom mm sizing. Firstly, is the A0 poster going to be good enough quality to print if it is just text and some graphics rather than photos?And should it be downloaded in PDF format? These are probably very silly questions but don’t want to start making things the wrong way. Thank you.

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