How to transfer coins from Coinbase to Ledger?
If you buy cryptocurrencies through Coinbase and store them there, Coinbase is in possession of your private keys and could theoretically disappear with your cryptocurrencies at any time.
Therefore, it is recommended not to keep the coins on exchanges, but to transfer them to wallets, where one is the only one in possession of the private keys.
You should therefore consider sending the coins from your Coinbase Wallet to your Ledger Wallet. For a possible later sale, you can simply send the coins from the hardware wallet back to Coinbase.