I have a 2 gang light switch box that has a dimmer light switch and a standard light switch in it. I I want to eliminate the two switches and put wire nuts on the wires and put a blank cover plate over them. I took the switches out but now I'm not sure what wires to wire nut together. I have 3 romex cables 2 of them are coming from light fixtures, one from a plug, and 2 black and white wires that are coming from another light switch in the room. Can anyone help me out?

You said you have 3 cables, one from outlet, one to a light fixture and another to another light fixture.
Then you confused me. You said you have 2 black and white wires from another switch. Are those wires in other cables? Are they the 3 cables? Does the other switch work in conjunction with one of the switches you want to remove?

Try describing your wiring again. Describe like this.

I have X 2-wire cables (black and white wire) and X 3-wire cables (black white and red).

Describe the wiring in the other switch.

Do you have a meter or voltage sensor?

How many terminals are on the dimmer switch and how many terminals are on the regular switch?