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Thank you for the simulation files.

To do such simulations for a given converter I would have to have its integrated circuit model in order to select the feedback elements?

I always checked the response to a single step and based on that I determined the stability and it is a good method, but I would like to try something new.

So GAIN according to the diagram in LtSpice is 20log(A/B). Can I take the amplitude - the maximum value of signal A and the maximum value of signal B - to determine GAIN?

Why do converters have a large GAIN at the beginning of low frequencies? And what does it mean that it is good bad and why?

If the GAIN is high at the beginning, does it mean that when the voltage drops, the converter will be able to respond quickly and with high gain without overshooting?

The diagram says "When A pkpk = Bpkpk then you are at crossover freq" it means that GAIN = 0dB and you can determine the phase margin, but what else does this information give me. How many dB per decade should the GAIN fall and why does it decrease with increasing frequency?

why on the second oscilloscope probe I see 0V on the low impedance side and on the high side where the feedback is I see a sine signal?

I made an injection transformer from a twisted pair of internet cable and the core I took from a common-mode filter, exactly two cores and a winding wound on it.But the output injection wires at the resistor soldering point were not twisted so that needs to be fixed