IF I WERE or IF I WAS? Conditional Sentences - English Grammar

In this video, Alisha answers 5 questions. - Can you explain why do you use "If I WERE you... I.." instead of "WAS"? - I'm stumped by trying to distinguish the exact difference in meaning between "evaluate" and "assess". Could you help me? - What is the meaning of the expression 'WORD!!!???' ? I've seen it in some movies, and I can't figure out what it means. - Can you please explain to me the meanings and uses of the word "happen", specifically in these cases: "Do you happen to...", "My sister happens to be a lawer"... I'm confused about it - What's the difference between these words "admire, adore, and idolize?"