Is it good to use it is safe to use
From the description:
bWAPP, or a buggy web application, is a free and open source deliberately insecure web application.
It helps security enthusiasts, developers and students to discover and to prevent web vulnerabilities.
bWAPP prepares one to conduct successful penetration testing and ethical hacking projects.
No, it's not secure. It's not meant to be secure. It's explicitly meant to be insecure, as a tool for training. You should not host it in a way that is world accessible. Host it on your local computer, accessible locally - or even better - in a disposable virtual machine. Heck, they even provide a pre-configured VM that you can download.
It should be noted that it's 6-7 years old now, so it's outdated. The learning value from it may not be as great as in 2014, as many attacks are mitigated by current technologies and best practices...