Life hacking refers to any trick, shortcut, skill, or novelty method that increases productivity and efficiency, in all walks of life.
This thread is for posting any promising or interesting ideas for lifehacks you've come up with or heard of. If you've implemented your idea, please share the results. You are also encouraged to post lifehack ideas you've tried out that have not been successful, and why you think they weren't. If you can, please give credit for ideas that you got from other people.
To any future posters of Lifehack Ideas threads, please remember to add the "lifehacks_thread" tag.
I'd like to see a similar list involving time rather than money. What are things that you can spend a chunk of time on upfront, which will save more time than that within one year?
The question can also be parsed into a cluster of overlapping prompts, some of which transition into general efficiency:
Ex: Touch typing. Keyboard shortcuts. Find a shorter path. Automate bills. Use a flashcard program like anki.
Ex: Learn what items you can buy in bulk. Cook in larger quantities. Schedule errands together.