tl;dr An oracle is a source of knowledge that improves your testing.
tl;dr A charter summarises your testing goal and guides your exploration.
tl;dr Heuristics are shortcuts to make decisions or pick what to test next.
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tl;dr Your notes structure your thinking, expand your memory and share information across the team.
tl;dr Testability measures the ability to test. When it’s easy, you get deeper and faster info about the product.