The distinction between “affect” and “effect” trips up lots of people, but with one or two little mnemonics, you can master this tricky pair in probably 95% of cases.

Effect is almost always used as a noun meaning “the result of some action.”

Affect is almost always used as a verb meaning “to influence or bring about change.”

Affect, which is an action (another word for “verb”), starts with an a, like action. There’s your first mnemonic. When something affects something else, it has an effect. The affect or verb happens first and the effect or noun second, just as affect comes first in the alphabet and effect second. There’s your second mnemonic.

My experience with mnemonics tends to be that once I’ve had to use them enough, I internalize the underlying grammar that they help me to remember so that I no longer have to remember…