Swapped out switch with three wires on the back and did not mark any wire!
Common and hot are not connected right because if I turn light on, it works but
Lights in other rooms on same floor do not! Have three separate sets of wires
In the wall behind light switch.. How do I find common wire?

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Originally Posted by Charles Rose

Swapped out switch with three wires on the back and did not mark any wire!

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Why not? This is one of the most basic rules when doing this sort of job.

Aside from any ground, a 3-way switch has 3 wire positions and typically three wires. The travelers will almost certainly be coming from the same cable. The common is the other wire.

OK, so you changed out a 3-way switch and didn't note which wire was attached to which screw.
Are all of the wires that were connected to the switch in the same cable?
You said

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Have three separate sets of wires
In the wall behind light switch

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I assume that means three cables. Describe how those are connected.
Were any of those wires disconnected?