Copy following link for wiring 3-way switches (where 2 switches control same lights)
http://waterheatertimer.org/How-to-wire-switches.html#3-wayEach 3-way switch has 3 screws (plug green ground screw)
Two screws are 1 color usually brass, and other screw is different color usually dark.
The dark screw is common screw.
There are two basic wiring diagrams: Line-side/Load-side with neutral wire. And Line-side/Load-side without neutral wire.
Open link above and scroll down to see both wiring diagrams.
If you need further help, I’m available over the phone at
https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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