Typically, if you wanted to know what a Pokemon's strengths and weaknesses are, you'd need to memorise it or Google it. Now you have a third option: the Pokeffectiveness tool.
All you have to do is visit this website and type in a Pokemon's name. The website should automatically narrow it down to the Pokemon you're looking for, and display a screen much like this:
Denoting all the info you need to know about how that Pokemon fares against other types. Useful, eh? And it kind of sounds like the creator is going to add/tweak some stuff in the future, so this may become even more handy soon. Great!