A snippit from the original film:
Luke Skywalker: No, my father didn't fight in the wars. He was a navigator on a spice freighter.
Ben Kenobi: That's what your uncle told you. He didn't hold with your father's ideals. Thought he should have stayed here and not gotten involved.
Luke Skywalker: You fought in the Clone Wars?
Ben Kenobi: Yes, I was once a Jedi Knight the same as your father.
Luke Skywalker: I wish I'd known him.
Ben Kenobi: He was the best starpilot in the galaxy, and a cunning warrior. I understand you've become quite a good pilot yourself. And he was a good friend. Which reminds me, I have something here for you. You father wanted you to have this when you were old enough, but your uncle wouldn't allow it. He feared you might follow old Obi-Wan on some damn fool idealistic crusade like your father did.
C-3PO: Sir, if you'll not be needing me, I'll close down for awhile.
Luke Skywalker: Sure, go ahead.
[C-3PO shuts down.]
Luke Skywalker:
[to Ben] What is it?
Ben Kenobi: Your father's lightsaber.
[He turns it on and hands it to Luke, who begins swinging it around while Ben continues.] This is the weapon of a Jedi Knight. Not as clumsy or random as a blaster. An
elegant weapon, for a more civilized age. For over a thousand generations, the Jedi Knights were guardians of peace and justice in the Old Republic. Before the dark times. Before the Empire.
Luke Skywalker:
[turns off the lightsaber] How did my father die?
Ben Kenobi: A young Jedi named Darth Vader, who was a pupil of mine until he turned to evil, helped the Empire hunt down and destroy the Jedi Knights. He betrayed and murdered your father. Now the Jedi are all but extinct. Vader was seduced by the dark side of the Force.
Luke Skywalker: The Force?
Ben Kenobi: The Force is what gives a Jedi his powers. It's an energy field created by all living things. It surrounds us, penetrates us, it binds the galaxy together.
[to R2-D2] Now, let's see if we can't figure out who you are, my little friend. And where you come from.
Luke Skywalker: I saw part of the message he was—
[R2-D2 abruptly begins playing Leia's holographic message]
Ben Kenobi: I seem to have found it.
Princess Leia Organa:
[in a hologram message] General Kenobi. Years ago, you served my father in the Clone Wars. Now he begs you to help him in his struggle against the Empire. I regret that I am unable to present my father's request to you in person, but my ship has fallen under attack and I'm afraid my mission to bring you to Alderaan has failed. I have placed information vital to the survival of the Rebellion into the memory systems of this R2 unit. My father will know how to retrieve it. You must see this droid safely delivered to him in Alderaan. This is our most desperate hour. Help me, Obi-Wan Kenobi. You're my only hope.
[looks to the side quickly, then crouches to end the message]
Ben Kenobi:
[to Luke] You must learn the ways of the Force if you're to come with me to Alderaan.
Luke Skywalker: Alderaan? I'm not going to Alderaan. I've got to go home. It's late, I'm in for it as it is.
Ben Kenobi: I need your help, Luke.
She needs your help. I'm getting too old for this sort of thing.
Luke Skywalker: I can't get involved! I've got work to do! It's not that I like the Empire, I hate it, but there's nothing I can do about it right now. It's such a long way from here.
Ben Kenobi: That's your uncle talking.
Luke Skywalker: Oh God, my uncle. How am I ever gonna explain this?
Ben Kenobi:
[pleading] Learn about the Force, Luke.
Luke Skywalker: Look, I can take you as far as Anchorhead. You can get a transport there to Mos Eisley or wherever you're going.
Ben Kenobi:
[resigned] You must do what you feel is right, of course.
The film doesn't explain what the Clone Wars are. We never actually go to Alderaan. We never visit Anchorhead. We never learn more about spice, save Threepio's line about being forced to work in the Spice Mines of Kessel (never shown). Luke never meets Vader, but Vader's shadow is all over the film (he kills Kenobi, and almost shoots down Luke in the climax of the film). Luke never uses the lightsaber in combat, though he does train with it on the Falcon as an exploration of his deepening connection with the Force. The Force is a central idea of the story.
Star Wars enacted a very important narrative concept for the sake of creating mythologies: the illusion of depth. SOME of that depth could be important details to the story, but other details are narrative flourishes, little details that give a sense of depth and breadth, allowing us alongside Luke to take our first steps into a larger world. Later released films and tv shows and peripheral materials like comics and books would explore some more of these concepts, such as prequels taking us back to the Clone Wars to actually show the tale of Anakin Skywalker and Ben Kenobi and how they were good friends and how Anakin "died." We eventually visit the spice mines of Kessel in both The Clone Wars and Solo. We see the actual world of Alderaan in The Clone Wars and Episode III, and get to know its senator Bail Organa in various works.
But notably, a lot of this flourish may have emerged in the editing room. Famously, Anchorhead WAS filmed for
Star Wars with the intention of starting the film with Luke noticing the battle between
Devastator and
Tantive IV overhead through visor binoculars and trying to convince his "friends" that he saw a real battle. This is where Biggs, and hence why Luke says "Biggs was right, I'm never going to get off this rock!" But we don't need to meet Biggs to relate to Luke in that moment. Meeting Biggs later in the film and having him say he finally made it into the Alliance is all we needed. We didn't need Biggs explaining he plans to leave the Starfleet Academy and join the Rebellion as a catalyst for Luke to leave. His friends are already leaving the moisture farm in other dialogue bits. Who knows how many other references Lucas originally planned to actually pay off in the original film, before it was cut down? Lucas' best ally was his editors.
Incidentally, this is also one that JRR Tolkien also had the insight to draw on (or rather, the books he could actually sell in his lifetime may have eucatastrophically found their way into this narrative concept through his inability to ignore his Great Tales). I'd argue that this wasn't entirely unconscious of Tolkien; he speaks about the importance of creating the illusion of depth when writing fairy-stories in his 1939 essay appropriately titled "On Fairy-Stories." But perhaps it was unwitting in the case of
The Hobbit - he initially borrows elements from the Great Tales like Elrond or Glamdring or the Necromancer Thû and spider-infested Mirkwood and a greedy Elven-king in his underground halls, but as he gets to the Battle of the Five Armies, the tale… grew in the telling. It was supposed to be a silly unimportant borrowing of concepts, but found its way to turn those flashes of colour into a depth of history worth adding a dash here and there more come the sequel.
Perhaps most comparatively, the film adaptations of
The Lord of the Rings benefited from the depth provided by
The Hobbit films not coming out first. They were able to draw upon Bilbo's story and its influence on the younger Hobbits, compare and contrast Bilbo and Frodo's respective journeys and relationships with the Ring, without actually showing Bilbo's journey beyond the necessary bit with Gollum and his sparse few appearances in
The Lord of the Rings. This gave a similar depth to the Hobbits that is afforded to the other free peoples and their histories throughout the trilogy. And like with
Star Wars, a prequel trilogy was eventually explored, with contentious results.
My point with all this is that
The Mandalorian also achieves the illusion of depth, but it does so in part by building on a vast and shared universe (non-illusory depth) alongside adding its own flourishes to Galactic history that may or may not pay off. They don't need to to be emotionally or intellectually relevant to the characters. So whether we go to Mandalore or not, its destruction by the Empire is deeply important to the lives of the surviving Mandalorians like Din or Bo-Katan.