Use ssh to connect terminal session to PI
You can ssh to connect to your raspberry pi, all you need to know is the IP address,
The default user is pi, and the password is raspberry.
Remote Desktop connection to PI
You can use VNC to remote connect to your PI, using your computer Keyboard and screen to see and control a virtual desktop.
Common VNC errors: https://www.web3us.com/how-guides/vnc-connection-raspberry-pi-unknown
PI 4B pinouts
Monitory CPU speed and temp Sample output