if you want to access the Pi using SSH,in the first place you need to get your SSH server enables using Raspi-config.
after that you need to get your RaspberryPI IP . you can easily get that by typing
ip addr | grep ‘inet .* eth0’
lets say that you got this result from the command above :
inet 192.168.2.109/24 brd 192.168.2.255 scope global eth0
now you can start SSH from the command line, passing it the Pi user’s IP address. you will be asked to enter user’s password