onegai was the first thing i learned for "please" i later learned kudasai was supposedly used more or something... question: does "onegai" exist and if so, what exactly is it used for?
onegai shimasu is the honorific of negau, which means ask or request. You can turn some verbs into honorific verbs by taking the i-stem of verbs, slapping an o at the beginning, and then adding shimasu.
examples:
okiki-shimasu = honorific of kiku (to ask). chotto okikishitai n desu kedo.... = i'd like to ask you a question but.... (can I?)
oyobi-shimasu = to call/summon (NOT on the phone). Sumisu-san wo oyobi-shitai desu ka? (Would you like me to summon Mr. Smith?)
what does sugoi mean?
amazing, good, awful. You don't hear it used for awful so much. But you could use it like "sugoi kaji" = awful fire.
i've heard that are (ah-re) was used for huh? true/not? what is it?
are = that (for things located away from the speaker and the addressee).
"ara" can be used for like huh, or kind of like a surprised expection. "Ara? You're wearing socks on your hands."
are gomen, gomen ne, and gomenasai different levels of politeness or something. (i'm pretty sure of the difference between the first and third one and not completely sure of the second term)
Yes. Gomen ne is more of a thing for friends and is a little more casual. Kinda like "My bad, eh?"
Gomen can be used just for someone who is under you. Like a younger kid or something.
Gomen nasai is more polite. Sumimasen is usually a safer alternative to use.
bosu is a huge insult, correct? (to quote from my source "the rudest way to call a woman a hag.")
busu. "bosu" could be used to say "boss" in Engrish terms. But there are better words for boss.
bakatare is stronger than baka but not as severe as bakayaro, correct?
Never heard of bakatare. Are you sure that's the correct way to say it?
baka and aho are interchangebly worse than each other depending on where you are in Japan right? Tokyo/Osaka difference i think...
Yes, that is correct.
And go ahead and list the other stuff. Or you can im me on aim and ask me yourself.