If you only need your node as a wallet to pay sats from time to time, you can open private channels to some large peers. This way your node won't be routing other people's payments and it will be safe to shut it down whenever you like. But if you have public channels to receive sats or earn some routing fees it can be dangerous to turn it off. You must make sure there are no pending htlcs, or the channel will be force closed when one expires.