2004trailblazer wont start or crank but lights come on when key is turned back why

What is your question?

I was driving and the oil meter kept moving up and down when I would get to a complete stop it would go straight to 0 but when I'm driving it'll go to 40 or more depending on my speed but this time it act like it didn't want to move when I press gas it took a few seconds to get it to drive it smoked the highway up bad and made loud noises I had to stop and let the engine cool off and drive again all the way home cutting it off and turning it on ,we had just put gas in too but the next day we tried to work on it it was cranking but smoking alot we added some tuneup liquid in the oil just to see if it'll stop smoking bad which it finally did and we started to check the coolant which we had water in it thinking it was okay meanwhile it has to use coolant and it overflowed to the radiater but looked like water mixed with oil in it idk it was a yellowish brown color but the battery chords thats connected to terminal was causing the lights to blink fast and now the car won't crank but lightscomeonpleasehelpusidontknowanythingaboutcars