To sell Bitcoin simply use Coinbase. To sell altcoins, use an exchange like Bittrex or Binance. To sell ICO tokens, try Coinbase Wallet.
First off, you’ll want to use Coinbase to transfer money back to your bank account as a US or UK citizen. So you’ll need an account there.
Moving on, to sell Bitcoin, Litecoin, Ethereum, Ethereum Classic, or Bitcoin Cash all you need is Coinbase. To sell these tokens, go to Coinbase, create an account if you don’t have one, send one of the aforementioned cryptos to Coinbase, hit the sell button, and then transfer your dollars to your bank account. TIP: If you want to save on fees, try Coinbase Pro.
Next, if you want to sell altcoins, find an exchange that lets you trade those alts for Bitcoin, Litecoin, Ethereum, Ethereum Classic, or Bitcoin Cash (try using Coin market cap to find what “markets” a coin trades under; most coins trade on Bittrex and/or Binance). Trade out of the alt and into a coin that trades on Coinbase. Then the coin that trades on Coinbase back to Coinbase. Then from there follow the steps for selling a coin on Coinbase.
Lastly, if you want to sell ICO tokens that don’t trade on major exchanges, then you can download Coinbase Wallet, send your tokens to that address, then find an exchange that trades your coin, access the DApp through Coinbase wallet, then trade your tokens for ETH, then transfer your ETH back to Coinbase. From there again, you would follow the steps for selling a coin on Coinbase. TIP: That may sound a little complicated, but if you managed to buy into an ICO, and really you aren’t using much different technology than you used to do that.
In other words, with Coinbase and an alt exchange or two you can trade in or out of any coin. So if you somehow ended up with cryptocurrency, but don’t understand how to sell it, this is how.