Please tell me the main idea of Nietsche's philosophy?

there is no main idea. he was not a 'system' philosopher that advocated an overarching idea or theory that encompassed all his thought. There are however some common currents.

1) Affirmation of THIS life/reality. This means witholding belief in any hidden reality, or deeper reality, or afterlife, or inherent/objective moral values, or inherent social progress, or soul, or 'inner self', or essence, or stable being. it also meaning affirming and expressing ones instincts and drives and energies and not just bottling them to fit in.

2) in the face of the 'inherent meaningless' one bravely CREATES new values in ones actions, stances, values (not just theoretically), knowing that there is no objective justification for doing so. Nietzsche praises people that create values based on life and not just follow abstract belief systems divorced from everyday life.

3) this 'creating' comes from the will to power, which is the will to constantly overcoming oneself, change, grow, adapt, and not merely conform.

4) psychology/history. Nietzsche thought a lot of everyday actions that are taken to be virtuous really are result of base instincts, drives, self-deception, hatred, weakness, inability to face reality, fear of genuinely creating in the face of meaningless, cowardice.

5) eternal recurrence. reality will repeat itself eternally. so live this life, AFFIRM this life, as if everything you will do eternally.

6) perspectivism. truth is percieved within a network of theories and conventions. each one sees from a certain aspect and sort of gets it right, and we have access to multiple perspectives, but there is no ONE meta-perspective that encompasses everything to give us a gods eye view.

Conservatism is a theory that once judgements are to be made which you do no longer bypass loopy and attach each and every thing. you do no longer attempt to be the watchdog of the international. you do no longer attempt to maintain all and sundry. government has a function to guard the persons, regulation enforcement. take care of our boarders, protection tension. to furnish standards for education, yet to bypass away the persons the choice to run there existence's a unfastened as achieveable. As little government as achieveable. usa is a great united states of america. i do no longer choose somebody telling what i will do with my existence. Liberals think of they comprehend how I could run my existence. No thank you

Nietsche was an interesting guy, he is credited with much of what is considered postmodern thought. And that is that whatever you want to be your truth is truth and also that there is no ultimate truth. Basically taking "perception is reality" and making it an absolute statement.

Women are dangerous toys.

"Whatever doesn't kill us makes us stronger."

He was a nut!!