One of the most common mistakes I come across is the inadvertent use of ‘affect’ when ‘effect’ should be used and vice versa.
Here is a simple way to remember the difference and thus which should be used when:
Affect is a verb meaning ‘to influence.’ For example: the baby’s incessant crying affected my ability to do my homework.
Effect is a noun meaning ‘the result of a cause’. For example: the effect of the baby’s incessant crying was that I was unable to do my homework.
Yours in crisp, error-free writing,