hi! hello

How i must to say, hello or hi? Or maybe how do you do? ("Hello": это более формально, как "Здравствуйте!"; "Hi": это неформально, как "Привет!")

iI don't know what to write here.
I'm from Sevastopol. It is my native town. It is situated in the Crimea. The Crimea is a paninsilapeninsula in the Black sSea.

1) Always capitalize "I"

2) Capitalize proper nouns, like Sevastopol, Crimea, Black Sea

hi! hello

How i must to say, hello or hi? Or maybe how do you do?

i don't now what to write here.
I'm from Sevastopol. It is my native town. It is situated in the Crimea. The Crimea is a paninsila peninsula in the Black sea.