Recommended exchange for beginner

I want to try Polymarket, i understand that i have to buy USDC, what exchange is good for a beginner? I've read good things about Kraken, Binance and Coinbase. I want to buy a small amount (5-10 EUR), then use Metamask as a wallet (people online recommend to not keep coins on exchange). For these small amounts, Should i just accept proving my identity? or look for no KYC option? If it's relevant, i live in Italy

Thanks to everyone who will reply and help me!
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