please tell me the difference between till and until properly??

both are a preposition and conjunction . However until is a formal way of saying it. till is a less formal/informal version of it. example . I will not go anywhere until I finish my work. example . I am not ready to go home til I am done with my homework. they mean the same thing :D

you can also see here the difference between unless and until. https://helloenglish.com/questions/161360/How-to-use-until-and-unless-in-the-sentence/189421