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Some questions about phase compensation

Hi,

Probably we meet oscillation issue when using op amps. Below are two methods to solve the problem.

1.Why does the pole create at 1MHz,td=RC=(R1//R2)Cx,rather than R2//Cx?

2.How to get the equation,R1Cx=R2Cc ?Would you please explain it in theory?

After adding Cc,how do the bandwidth and response change? Why?

3.For large capacitive loads,we usually add c2 and R4.How to get the correct value for c2 and R4?

If changed like this,how do the bandwidth and response change? why?

Thanks!