How to hold two breadboards together in a way that they dont take apart so I can put them in my car easily and go on travel?
There are so many wires between them
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One way to handle this problem is to attach the multiple breadboards to a suitable sized piece of thin plywood.
If your breadboards look like this then it is obvious how to fasten the breadboards to the plywood with some short machine screws.
On the other hand if your breadboards look more like these then the easiest way to get them to stay in place on the plywood is to apply a bead of hot melt glue along the sides in the corner down next to the plywood.