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More and more exchanges are popping out of the ground. Many of them are listing different tokens. You can check the market your are looking for on CoinMarketCap. At the beginning most of the free earned tokens are not listed on big exchanges. So in the first time period, if you want to sell your tokens, you can trade them through decentralized exchanges like Idex or Bancor.
For projects with high quality, the tokens will also appear on centralized exchanges.
Here you can find a list of the current biggest centralized exchanges.
After your registration you'll get asked to verify your self (KYC - Know Your Customer). Check out the exchange support site to find out your trading and withdrawing limits. Always activate 2FA (Two Factor Authentication) to make sure, your account doesn't get hacked.