How to get Wi-Fi on a PC without Ethernet?

How exactly can I connect my PC to Wi-Fi if it doesn't have an Ethernet port? I've been searching for solutions, but most of them seem to assume that the computer has a wired connection option. Is there a specific adapter or dongle that I can use to enable Wi-Fi functionality? Also, I'm not very tech-savvy, so could you explain the process in simple steps? I'd appreciate any detailed guidance on how to set it up and make sure it's working properly. Thank you in advance for your help!