1. Test for Quality not for Quantity
There may be 1000+ bugs in a module but the testers should never shoot for quantity. We must find the most important and crucial bugs, faults where it will help the company saving from poor quality.
2. Learn prioritization
This will help in detecting the most valuable bugs first. This will also help the developers to fix the most wanted functionality of their application as early as possible.
3. Improve and practice written communication
A good tester must have an excellent written communication skill since he/she deals in writing test cases, bug reports and so on.
4. Be professional and objective
Software testing is a profession and has an objective called Quality! Quality!! Quality! . Whenever we test a piece of code or functionality we must do it from a fresh and objective perspective. Always test with an open mind and a need to use exploratory testing.
5. Never be humble with Software
Always test the software with an intent of breaking it and test using thinking out of the box.
6. Investigate each and everything
Whenever we have questions in our mind we need to ask immediately and clarify them so that there won't be any hidden problems. Similarly, if we have any suggestions then we also need to share them as early as possible for time consuming, appropriate quality and delivery on time.
7. Wear a mask of an end-user
To find the most valuable bugs we need to synchronize our technical skills with an end-user's mindset and surely we will find the best bugs before the software reaches the hands of the users.
8. Improve the efficiency of bug reports
An effective bug report will always let a developer know about the information of a bug and it will be easier to fix them at an early stage. For this we need to provide screen shots and a procedure to recreate them and other detailed descriptions.
9. Learn from your mistakes
Mistakes are meant for learning, not repeating! We need to always try to improve our bug reporting, prioritize bugs and communicate better with development teams.
10. Always be Passionate
To succeed in any field we must always be passionate on whatever we do. Try for new training opportunities, learning new technology, methodology and gaining experience from fellow testers and so on.