"Whenever" and "Seen"

[BitsyNaceyDog]

My husband and I go back and forth about whether the word kitten should be pronounced "Kit-ten" with both t's pronounced sharply, or "Kit-en" with just one pronounced... It's the same with mit-ten versus mit-en

I've always pronounced it "Kit-en" and it would drive my ex-coworker crazy, she insisted it was "Kit- ten".

Affect and effect. What is the proper way to use this? "How will this affect me?"

That's one I can't get right. My husband has tried to help me with it many times, but I just can't get it right. I really try to avoid using those words.