“Affect” is a verb, and “effect” is a noun—except when it’s the other way around. and you can remember the verb form is spelt with an A because a verb often denotes an act. Act begins with A, affect ...
It’s embarrassing but true, even the best of us can misspeak and use a word incorrectly. Can't figure out the difference between "affect" and "effect." Squabbled over the meaning of "factoid"? Ever ...