When talking about the difference between two things, Xiao, you'll want to ask, "What's the difference between 'let go' and 'move out of my way,'" (instead of "from," use the word "between"). At first, I thought you meant, "Let go," like, "Let go of my hand," which means, essentially, to stop holding. If you mean, "Let the car go," though, or if you're trying to express the thought, "Let him/it/her/them pass," then you need to use a direct object (that is, "let" in this context means "permit," and it requires a direct object so that the listener understands what you want the permission granted to). "Let the car go," would be a friendly but direct way to tell someone to permit the car to pass. This would be directed at someone who has the authority to open a gate on a street, for example. "Move out of my way," is a more aggressive way to tell someone whose body is blocking your path to move--and to do it quickly! I hope that helps.

I think it is: 'Let" is the verb "permit, allow...etc" so "Let go" means allow something go! and it's different from "Let's go!" it's the contraction of "let us go!" and means more or less the same as "c'mon!" Move out of my way means that you are ordering someone to budge out or get out of your route or track! (in literal sense) I hope have helped you! :D