Question

what is the defferance between effect and affect

Answer 1

"Effect" is a noun, and "Affect" is a verb.

Answer 2

Not always; both can be nouns or verbs that all mean different things. Examples:
-"That Korean barbecue had a really bad effect on my stomach." //Noun
-"I effected change within the community by volunteering." //Verb
-"After his wife died, he developed an unpleasant and choleric affect." //Noun
-"Having low tire pressure affects your gas mileage." //Verb

Answer 3

I didn't know that. :o

Answer 4

Yup. You learned that bad rule somewhere along the line because in many writing environments, "affect" appears only as a verb (the other sense is clinical) and "effect" appears more commonly as a noun (its use as a verb is quite common in what is generally regarded as a higher register of English).

This is the problem with shorthand-type rules. People learn bad stuff.