This is actually a super useful particle that you’ve already been using without knowing it! The 시 particle shows up in 안녕하세요, with the literal break down of it being 안녕 meaning peace and 하세요 (하다 + 시 + 해요체 honorific form)
Wanted to bring in more grammar posts and I think one of the best things starting out is learning some beginner conjunction! Learning conjunctions like how to say ‘and’ in Korean is the easiest way to take your sentences and make them more natural and flow better!
One thing about Korean many people struggle with is the dynamics between people and speech. For native English speakers; especially if English if your only language, formalities is something that doesn’t exist to a quarter of the extent as in Korean. Korean is a culture based highly around respect and knowing or understanding you position and others.