lifehacks

In this internet age, you can find a video or written information on just about any topic you can imagine. Naturally, there is a slew of sites dedicated to telling you and showing you how to do various things. 

There is also a whole ton of pages telling you things that you've been doing wrong, like here.

And here is one list of them, from Lifehacks. And here is one item from that list which I will certainly be putting to use.