How do I connect my PC to Wi-Fi?

Could you please elaborate on the steps required to successfully connect my personal computer to a Wi-Fi network? I'm not very technologically savvy, so I would appreciate it if you could break it down into simple, easy-to-follow instructions. Do I need any special equipment or software? And once I've established the connection, how do I ensure it remains stable and secure? Thank you for your assistance in this matter.