How to make your progress bar work.....? How to start your webpage with a progress bar loading????

Question

please send me codes and explaination

https://code.sololearn.com/WZP0I714JI5a/?ref=app
like above code how to make it loading ??😭😭

Answer 1

https://code.sololearn.com/WXHUApnqKBUq/?ref=app