As I can see, it says access denied for Rahul @localhost . I have listed down few issues:
There can be a chance that user Rahul does not exist at localhost.
You might have entered the wrong password.
You might have not started MySQL server. If it’s started, the port number is not 3306.
These were few of the basic techniques which can help you troubleshoot the stuff.
If you want to get more insights into SQL, check out this SQL Course from Intellipaat.