Battery good but when key is turned it want say anytging

Yes, it has to do with the ignition switch. but just as possible could be a battery connection from the battery to the switch. So, sometimes turning key to ON causes no dash lights or warning lights to come on?
That sounds like a bad switch, or more likely, a bad battery connection or a bad connection between the battery and the switch. First thing to do is check the charge of the battery, it must register at least 12 volts. 12.6 volts is the ideal for a good and fully charged battery. Clean and tighten all battery connections.

Sometimes when you have a poor connection, from looseness to corrosion, and you turn key and see all warning lights and gauges come on, and then turn key to start and everything goes black...that can happen because the power surge causes the bad connection to come apart. So check for loose or corroded connections.

check connection and wires at battery for damage or corrosion if good check for power to ignition switch if no power check for damaged or shorted wiring if good turn key and check if power going to relays or accessory's at fuse panel if no power switch may be bad

I'm not a car mechanic, but, it sounds like you might want to check the fuse to the ignition switch, and, if that fails, it might be a problem with the Start Safety Switch on the transmission. Good luck.

neutral safety switch or ignition switch...if dashlites, etc come on when u turn ignition on, prob neutral safety switch...chek brightness of headlights for good all around connections...

Dead battery or broken ignition switch possibly

A mechanic would check for voltage at the starter, the neutral safety switch, and the key switch. Also check the ground connections.

indicates a problem in the wiring harness under the dash to the switch or the switch

It could be a bad ignition switch, do you have instrument panel warning lights when you try to start it?

May be ignition switch and/or neutral safety switch (IF equipped with one). Brake light switch and neutral switch may be working in union. Sww if you can see it under the wheel on the column and tell if you can adjust it first before replacing.

low oil boiling water sometime automatically stop the engine for further damage. stop the engine wait for sometime. fill up oil/water. check fuse/switches for engine/lights/dimmer. re start.