@ShrillBear52 Does the buzzing stop when you press the string down behind the nut? If so, just install a string tree. Stratocasters usually have one on the two highest strings, but many people also put one on the D and G strings too. Also, if it's a cheap knock off (not a Fender) Strat, they might have done a crappy job of cutting the nut properly.
I'd also recommend going through all of the steps in that tutorial, though. You could very well find that the nut is not the problem, because without detailed pictures or measurements, we can't say for sure. And you'll learn the process.
With regard to the truss rod, you can usually make adjustments by turning it about one quarter turn at a time. So if you turn it more than a full turn or two without any changes to the measurements in your neck relief (see tutorial), then it's almost certainly broken.
You can see for your self,i tried to do the press the strings while play them open,not sure if you chould judge about it how i did it in the video(the stratocaster) in the other video i hope you can hear how to first 4 string are buzzing while open ,expct the B and high e,(the les paul)
Well, that not what I meant at all. I meant this. In any case, it was pretty clear that your nut is cut VERY deep (on your "Stratocaster" from the factory. The strings are basically resting right on the first fret. That's where the buzzing is coming from. I can't see how much relief your neck has, but if it's too straight, it will only make much the buzzing worse. After following the tutorial completely, you may still find that you'll need a shim in your nut, or to have it replaced.
The second video (your Les Paul) wasn't helpful at all. We would need to see the nut, the height of the strings at the 12th fret, and the height of your bridge (at both ends) to diagnose the problem.
Since you think that the truss rod is broken on your strat, let's just focus on your Les Paul for now - one guitar at a time . Using the tutorial from a few posts back, follow and execute EACH step. Still doesn't seem like you've done this.
If you still have questions AFTER FOLLOWING THE TUTORIAL, then start a new thread (this one was/is supposed to be focused on music theory) in the help section that includes very specific details, like measurements of the height of your strings at the 1st, 12th, and last frets (or pictures that show string height or neck straightness). Pictures like this, this, and this would be helpful.
Did I mention to follow the tutorial first? Just making sure.