What can useful things can be learnt?

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Lifehacks as they say are supposed to make your life more efficient, productive and manageable. Do any of you have any suggestions to Lifehacks that are very useful to share with me and other mylot users? Edit: What I mean by Life hack is "any trick, shortcut, skill, or novelty method that increases productivity and efficiency, in all walks of life." Everyone has their own ways of doing a particular task. There will always be things in life that will make things difficult and a "life hack" is anything that a person does to get around it. The problems don't necessarily have to be major problems, it can be as minor as preventing the cord/wire of an apple charger from breaking and one "life hack" or by how to effectively clean a sticky greasy oven by using baking soda or limited supplies.