Target device

Brand new here, just had a basic question on network access. In Zaid’s Learn Ethical Hacking from Scratch, he starts out with wireless attack methods, but I’m not clear on the methods involving accessing non-wifi networks or devices. Is this divided into client and server attacks? On the client side, is the only viable option to get them to click on a link with a payload? Is it possible to monitor packets without a wifi connection? How do you target a specific computer, with an IP address?