Will to power defined by 4 aspects:
Ontological
Organic
Psychological
Societal
1. ontological
Nietzsche argued that matter is representation of force or energy. All is force against force, nothing more. Physics only considers the objective aspect of matter-energy, relational properties. Nietzsche asserted that there is a subjective aspect of energy, a subjectivity.. a drive.. a will. (not consciousness). All forces in their subjective aspect are this will. Nietzsche advances Shoppenhauer's will to survive into "the will to power", it is effectively based on it. He argued that this subjective element of energy strives to assimilate more energy to it's porpose (telos). Again this is not conscious. This makes the will to power a teleological principle that underlies everything.
Nietzsche here is not advocating free will. There is no choice as far as the will to poer is concerned, it is not conscious. He argued that consciousness does not cause actions, but merely acompanies them, so he rejects free will. All is force, force has a subjectivity, that subjectivity is a striving for development, a will to power. The world defined and described internally by it's intelligible character is simply the will to power.
2. organic - "Life is merely a special case of the will to power"
For Nietzsche the will to survive is merely the lowest degree of the will to power.
If an organism is left by itself, it will seek to develop, to grow and become more complex. It will defend itself because it's end would halt it's development. The will to power does not aply merely to animals such as humans, but also to plants and everything else. Plants grow and seek resources just like you and me, we seek to develop our intelect, health, wealth, status, resources and so on. It is not mere greed, but growth.
Simbiosis is a strategy available to organisms. The power of the whole increases the power of the constituants therein. A very good example are the coral reefs. Humans may gain adavantage by being part of a group, religion, nation, ideology and so on. It is in these settings that characteristics such as compasion, generosity, altruism have their place. We have evolved these in order to maintain and increase the power of the group and through that our own individual power.
Nietzsche considered complex organisms such as humans to be agregates of wills to power, not merely one will. An organism is a higherarchy of systems. He disagreed with Darwin on evolution and considered that organisms are not merely reactive, but proactive. This means they do not merely adapt to the environment, but seek to dominate it. Again the coral reef is a very good example of this, but man is the ultimate example. He also advocated for soft enheritance, what we know today as epigenetics.
3. psychological
The will to power is not some spiritual principle.. It is ontologically one with the body, but epistemically distinct. We derive pleasure from overcoming obstacles, anything that stands in our way, so this means our telos is not mere pleasure (happyness), but power. Knowlege is power, because it aids us in overcoming problems. Think about the invention of penicilin for example or acing an exam, defeating your enemy, finally succeeding at writing that program. The joy you feel is a byproduct. You consciously asume that you act in order to get this byproduct, but in reality subconsciously the will to power is what drives you, keeps you alive and pushes you to overcome limitations.
Nietzsche argued that obstacles to our power cause pain and suffering, so by overcoming them we advance and grow, gain happyness. This makes suffering and pain valuable. Without obsacles and pain we would have not evolved this level of complexity.
This is what he means by "What doesen't kill you makes you stronger", well not you specifically, but the species.
4. societal
Sometimes falsities allow us to gain power. A religious leader and it's members may benefit from the lies they spread, thus gaining power for themselves. It is not always the case that knowlege and honesty nets you more power. Sometimes denial and delusion does. We merely believe in things that bely our interests. Our consciousness presents us with distorted presentations of reality, our senses are biased. Beliefs are based on perspectives of power (subconsciously). Slaves will value freedom for example, people who already posess some power will value justice and the trutly powerful may value the love of humanity. Such a person may be friendly and genuinely love his enemies, because they are obstacles through which he/she may grow (imagine Jesus Christ).
“Well-meaning, helpful, good-natured attitudes of mind have not come to be honored on account of their usefulness, but because they are states of richer souls that are capable of bestowing and have their value in the feeling of the plenitude of life.” ― Friedrich Nietzsche, The Will to Power
Nietzsche sees Christianity for example as the perspective of the weak. It offers mataphysical punismnet to our enemies, as real physical punishment is not possible. It offers an afterlife of eternal happyness, which is only of value to someone who suffers from life. Escapism. He called it "slave morality" as it offers values that only serve the power interests of the weak and presents them as objective absolutes (which they are not). He considered that no morality is absolute or objective. He considered slave morality to be dangerous, because it only considers the power interests of the weak, it values the meak and mediocre over the great and capable and so it has halted humanity's power progress.
Peterson calls this the "crab mentality". The prime example ofc is communism, forced equality. The tallest blade of grass gets cut.
Christianity's values are so engrained in society as culture, that even atheists unwittingly value this perspective. For nietzsche socialism is Christianity without the God, but without God, there is no sanctioning of the slave morality. "God is dead" means that if one does not believe in God, one has no logical right to believe in a morality which this deity ushered in.
To surrender yourself, to make yourself a slave to a teaching or belief, that makes it so that belief will always rule you.
\o/ song time! (related to subject)
When I was born the seed was sown
I will not obey, my life is my own
Battled those, who wish to enslave me
Exposed the lies that enrage me
I don't believe in heaven, I don't believe in hell
Never joined the herd, could not adjust well
Slave and master, it's not for me
I choose my own path, set myself free
I, I go my own way
I swim against the stream
Forever I will fight the powers that be
I, I go my own way
I swim against the stream
Forever I will fight the pοwers that be
The eagle flies alone
Reject the system that dictates the norm
This world is full of lies and deceit
I have felt betrayal, cut so deep
Suffered defeat only to rise again
I, I go my own way
I swim against the stream
Forever I will fight the powers that be
I, I go my own way
I swim against the stream
Forever I will fight the powers that be
The eagle flies alone
Alone!
I, I go my own way
I swim against the stream
Forever I will fight the powers that be
I, I go my own way
I swim against the stream
Forever I will fight the powers that be
The eagle flies alone