Can anyone please explain me, how do i connect my bitcoin core by terminal and connect. whith bitcoin-cli

I have done

sytemctl start bitcoin

then i've made

bitcoin-cli getinfo

but it returns this error

bitcoin-cli -rpcconnect=127.0.0.1 -rpcport=8339 -rpcuser=*** -rpcpassword=*** -getinfo
error: Could not connect to the server 127.0.0.1:8339

Make sure the bitcoind server is running and that you are connecting to the correct RPC port.

Can u specifie my how i can run server daemon and bitcoin-cli on terminal