1. Just bought a Nano Ledger S, transferred some bitcoins, it reached the wallet, but transaction not yet confirmed, can I unplug Nano Ledger S now, or does it transaction need to be confirmed before I unplug it?
2. When is the proper time to switch off Nano Ledger S, is there something special I need to do before switching off?
3. How many bitcoins can I hold in the Nano Ledger before it gets full?
Once the transaction is sent, there is nothing else to do, so you can close your wallet. The is no limit to how many bitcoins your wallet can hold.