Knick, I am so sorry you didn't get it. This is a movie that, save for its incredible sound effects, editing, and score, is devoid of the need to use sound to explain what is going on. Every single aspect of the story is explained visually. The words? They just make it a little more clear.
In this movie, Furiosa is an Imperiator, a driver of a War Rig that moves fuel around the holdings of Immortan Joe and his two brothers, the People Eater and the Bullet Farmer. These powerful machines are a status symbol in society - gasoline is how food and water travel in the areas ruled by Joe, and how they defend from the scavengers without. But Furiosa has betrayed Joe - and her War Rig is loaded with his five wives, genetically pure women that he is attempting to breed a non-mutated child upon.
Very early on in the movie we are shown Joe's two current living children. Neither are healthy - both require oxygen to survive in all situations. One is a tiny man, akin to a child born under the effects of thalidomide, while the other is physically fit but clearly unintelligent. Joe himself has flesh that is blistered and weak and he requires a Bane-like breathing apparatus to move around. In the very first scene, Joe is barely able to move on his own, but he rules because he controls access to water. Water is life. But it is clear this is not enough for Joe.
As we watch his most loyal servants gird Joe, they place a codpiece on him, bearing his symbol in the only prominent display on his costume; this is juxtaposed to the brutal chastity belts that his wives wear, designed to tear off any invading object. These two objects tell the story that Joe later confirms in dialogue: his true goal is not power as represented by fuel or by water or by food or ammo. He is not trying to wage war or conquer the wastes. His goal is to breed pure - something neither he nor his brothers have been able to accomplish.
Why is this so? Again, we are treated to a visual show that tells us why. Joe rules the Citadel, looking over the masses from literally on high. He distributes water from a massive font that he controls. His War Boys are slavish and insane and worship him as a god; they believe this life is their first, soon they will reach their half life and upon their death, be welcomed to Valhalla. Joe has created a cult of literal worshipers, who call him the Immortan - they believe he cannot die. But immortal gods do not spawn flawed humans. He is trying to create his legacy. Again, this is later confirmed in dialogue - his brothers questioning why Joe has thrown away thousands of gallons of gas, dozens of vehicles, even more in War Boys and ammo, for five women. But we don't really need to hear this to understand why.
Similarly, Furiosa's motives are equally justifiable. It is evident from the first introduction of the character that she hates what she does. While the others who serve Joe worship him (rather literally) and (also literally) salivate at the chance to die for him, her eyes show a certain determination and a toughness that is mirrored only by the look one sees in Max's eyes. The same determination - survival.
See, now I get to Max. Max's place in this movie is as a fellow traveler. The story wouldn't work without him - without Max's intervention, Furiosa would have been captured, and probably killed, and certainly never have overthrown and killed Joe. But he is the muscle and the advisor, while Furiosa is the leader. When their crew of escaped slave-wives and strange old women and a War Boy-turned-good need a leader, they look to Furiosa. Max might fight along side her and save her life and give her advice that she needs to hear, but he isn't the hero. Furiosa is the hero, because she made things happen. She is responding to Joe's tyranny over life itself - first by emasculating him by stealing away with his prizes, and then by challenging him for dominion - and finally by executing him using the war machine that he rides and the breathing apparatus he requires, each step required for her growth from desperate fugitive to conqueror. We watch the carnage through Max's eyes, who, as a captive of Joe's War Boys used for his pure blood, merely uses Furiosa to escape his bonds. While he eventually wants to help protect Furiosa and her escapees, this is not because of any feelings towards her, but out of desperation to make good his past failures.
Immortan Joe and his two brothers represent the worst of society - a society preoccupied with genetics, with sex, with conquering. There are no direct analogues here. This is not a tale told to give a specific warning, but to remind us two truths that we all know: one, that tyrants create always their own worst enemies, and two, that the bigger one is, the harder they fall. And when we watch Joe fall and how his body is literally torn apart by the masses he teased with a hint of water, we realize that he fooled nobody but himself in his quest for true immortality.
You can definitely see why this movie got the anti-feminists up in arms. Furiosa is a powerful action hero, motivated by emotions and need and strength. She is able to be angry, sad, hurt, wounded, and even to show great caring, while still being strong. She has more agency than any female action character since Sarah Connor, and proudly should be considered beside her, Ripley, and Officer Lewis as one of the finest female characters ever written in action/sci fi.
Also the action is fucking awesome. See this movie. See it now in theatres, as big a screen as you can.