okay so i just got my technician license last month and ive been listening to the local 2m repeater for a few weeks now. i kind of understand whats going on but the CTCSS stuff is really confusing me. like i programmed a tone into my baofeng (yeah yeah i know) and it lets me key up the repeater now but i dont fully get what the tone actually does. is it like a password? and also sometimes people are mid conversation and i dont know if its rude to jump in or if i should just wait. i tried to say my callsign once between transmissions and someone came back to me real quick which was cool but i felt like i was interrupting something. is there like an unwritten rulebook for this stuff because nobody explained any of it in the license class

So the CTCSS tone is basically a subaudible signal that goes out with your audio when you transmit — the repeater's receiver is set to only open up when it hears that specific tone, otherwise random noise or signals from other areas might accidentally key it up. Think of it less like a password and more like a filter. Some repeaters also send a tone back to you on the output side, which your radio can use to squelch out everything except that repeater's signal, but that's a separate thing called DCS or just receive tone and you don't always need to program that in.

As for jumping in — what you did was exactly right. Waiting for a gap and just throwing your callsign out there is the normal way to do it. If the guys are in a ragchew and they want to keep going they'll either acknowledge you and bring you in or they might not hear you and that's fine too. Just try again. Nobody owns the repeater and most folks are happy to have someone new jump in, especially once they know you're a newly licensed op. Don't stress it.

yeah the tone thing tripped me up too when i first started. one thing that helped me was thinking of it like the repeater is sleeping and the tone is just what wakes it up. once its awake it re-transmits whatever you say on a different frequency so people farther away can hear you. pretty neat really when you think about how old this technology is and it still just works.

and honestly dont worry too much about ettiquette at first, most repeater regulars are pretty chill about new hams. the main things are just dont key up while someone else is transmitting, leave a pause between overs so people can jump in, and id yourself every 10 minutes or at the end of a contact per FCC rules. thats basically it. you'll pick up the rest just by listening for a while which sounds like youre already doing