Yes, you are correct! A hand is just the part at the end of your arm! If you describe something that is done with arms and hands, however, since you can't separate them of course, use the word "arm." For example, if you give somebody a hug, you say that you put your arms around them. I hope this was helpful!

yes, correct. A hand is attached to an arm like a foot is attached to a leg.

Кукусики)Ну насколько я знаю Arm это кисть,а hand это вся рука