I watch monero cli easy video on youtube by GingerAle.I did everythig like this video except that I used monero-wallet-cli.exe --daemon-host (moneroworld random nodes ip):18089 --trusted-daemon.I think it works properly and syncing completed .But just like in video (Error mining has not been started :possibly lost conection to daemon ), I get this message .Although monerowallet.cli.exe finished syncing ,monerod is continued syncing eg .- - - - -/- - - - - -that consume much data.I don't know am i mining or not yet . what should I do ,pls?Btw I just a beginner .
Apparently you are trying to start mining on a random remote node.
When you connect your wallet to a remote node and enter the start_mining command, you are in fact asking the remote Monero daemon to start solo mining and sending the reward to your address if it finds a block. Obviously, the owner of the remote node will not allow random stranger's wallets to use his computing power (by starting his Monero daemon with the --restricted-rpc option).
The start_mining command will only work if your wallet is connected (with the --trusted-daemon option) to one of your own Monero daemons (i.e. started without the --restricted-rpc option, and not openly accessible from the whole internet).