“Affect” and “effect” are so simple that they do not appear in any vocabulary books or standardized test guides. But if the Internet is any indication, the world would be an emptier space if people’s lives depended on whether they could tell the difference between the two words.
For the sake of preserving our species, here is the difference:
So what does RAVEN have to do with “affect” and “effect”?
RAVEN will let you down only when you have to use “affect” as a noun and “effect” as a verb, i.e. rarely.
Now that you know the difference, bad grammar won’t affect your writing’s effect on your readers.