1.Think completely and work and that thinking should be done at once,do like this when writing also ,as little thinking causes mistakes.
2.If u add a new feature or update an existing feature think of all the ways of how it can be improved
3.Increase patience
4.do important work first
5.If u can't reproduce a bug normally then test thoroughly and try to reproduce for 2,3 times.
6.As far as possible try to reproduce bugs in win10 64bit as most of the users in the world use win10
Make this read by your developers or else mistakes will happen.If they completely think and work then bugs will be properly fixed