Ask HN: Personal tricks and solutions to small problems?

What are some tricks or solutions to small problems, preferably to problems that other people don't realize they have? Some that may induce the eureka effect?

For example, if you are always cleaning your download folder or if it is containing GBytes of garbage, just use /tmp as your Download directory.

Let's use this thread to collect all of these tricks and solutions and dump them later into a public repo.