Complete and simplified Raspberry Pi Wifi configuration Procedure

Raspberry Pi official page- Clearly and simplified steps to connect to wifi configuration

https://www.raspberrypi.org/documentation/configuration/wireless/wireless-cli.md

Raspberry Pi – steps to connect to wifi configuration

https://thepihut.com/blogs/raspberry-pi-tutorials/83502916-how-to-setup-wifi-on-raspbian-jessie-lite