Test it with your head, not hands!

There is still the stereotype that manual testing is easy, that it is just a step up from there, that it is "push buttons", etc. And in fact, manual testing is a massive layer of analytical work. It is one of the pillars of product quality assurance. Perhaps the very name "manual testing" is incorrect because we test with our heads, not our hands! So let's talk about how and why manual testers use their heads, examples, tips and techniques.