How to make a register/login system in php Part -7 Logging Users to the Website

How to make a register/login system in php Part -7 Logging Users to the Website -~-~~-~~~-~~-~- Please watch: "Thunkable Beginner App Tutorial #6 " https://www.youtube.com/watch?v=BTRkuKmkDNk -~-~~-~~~-~~-~-