What are the elements of a good bug report?
Elements of an Effective Bug Report
What is the problem? How can the developer reproduce the problem (to see it for themselves)? Where in the software (which webpage or feature) has the problem appeared? What is the environment (browser, device, OS) in which the problem has occurred?
What is the most important part of bug report?
A good bug report should contain only one bug and be clear and concise yet informationally dense. It should contain environment details and user steps that allow the developer to reproduce the bug on his side. Without being able to reproduce the bug, developers are essentially stumbling in the dark.