Come over: This command is asking a person to come to you. I usually use it to ask someone "Do you want to come over?" meaning "Do you want to come over [here] to my house?" You can also say "come over here" and that means that you want the person to go to where you are. It is the same as saying "come here" Bring over: When you ask someone to "bring over," you are asking them to bring something over. So the person should take an object with them. For example: "Can you bring over a dessert?" means "Can you come here, and have a dessert with you?" Do not think of "over" being like over/under here. See definition 2. o·verˈōvər preposition 1.extending directly upward from. "I saw flames over Berlin" synonyms: above, on top of, higher (up) than, atop, covering "there will be clouds over most of the state" 2.expressing passage or trajectory across. "she trudged over the lawn" synonyms: across, around, throughout "he walked over the grass"

We use over when we are taking someone or something from one place to a place where someone else is, usually when we are talking about our homes. For example, we would say, I’ll bring my holiday photos over when I come to visit you, or my son is bringing his new girlfriend over to our house tonight. I hope this helps!

'over' simply refers to the place of the speaker, or to the destination. 'come over here' = come to the place where I am Hope that helps!