I want to buy some BTC with cash locally, the seller i found says : "send BTC to your wallet. After 1 confirmation On blockchain, collector takes from the table cash."
Is this enough to be sure i will receive the bitcoin sold me? Or its better to wait for 2 confirmations?
I think 1 confirmation is enough to say that your Bitcoin is coming to your wallet, there will be no cancellation since it's already approved and put to the chain. You just need to wait miners to confirm your transactions and then your will received it on your wallet.
But becareful, there are a lot of scammers. You need to check their background and history. It's better to use local exchange or use escrow with good reputation, instead to buy from personal seller.