Lost power to my dash and cannot start my car?

I have lost power to my dash and cannot start my car. I had the battery checked and the battery is good. I checked grounds to ground by battery and to engine block and it’s grounded. I replaced the main fuse because it looked a little sketchy. I am currently trying to test the ignition switch, but I am not sure I am doing it right. My readings are coming in low. I am a beginner for sure. I have basic tools. Multimeter, test light and have no problems replacing what is bad but need advice how to find what is bad. I don’t want to just throw parts at it.