what is the good way to say someone.....bye bye...

It depends on who it is; how much I care for them and how soon I am likely to see them again. If its a colleague at work I'll usually just say "See ya" but, if its either of my sons, whom I see less often & care more for, I would give them a hug and tell them to take care & that I love them. For my mum, I would either just say 'bye', 'take care' or, if she was going to be away for a few days or wasn't feeling too good, she'd get the hug too.