From left to right…..

left switch just turns the garage light on… 3 wires, black, red, and white. There is a single garage switch in the garage that controls the same light



Middle switch
This controls exterior wall lights, no other switches. 2 black wires

Right switch

This is a led kitchen light, it has another switch in the kitchen controlling this same light as well. 3 wires black, red and white. This is the only light that I would like to dim.

There is no ground on any of the existing switches- there is a bare ground bundle in the back of the box

I purchased 1 caseda dimmer and 2 caseda switches, it says on the box for the 2 switches that they require a neutral