How do I get Wi-Fi from my router?

Hello there, I'm curious about something. I've got a router set up at home, but I'm not quite sure how to get Wi-Fi from it. Can you please explain the process to me in simple terms? I'm not very tech-savvy, so any guidance would be greatly appreciated. I've heard about things like passwords and network names, but I'm not sure how to go about setting them up or connecting my devices to the network. Thank you in advance for your help!