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.think of each bit of how it can be improved but don't add useless and unnecessary features
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 all of your developers or else mistakes will happen.If they completely think and work then bugs will be properly fixed