This was the first scene, I'm pretty sure that she's training here. The question is who is training her? I definitely think that it's possible that Leia is.
Also she's using a lot of things that Luke used, the helmet and remote from A New Hope.
There were some other really awesome scenes like the Resistance on the forest planet, and other really cool stuff, but nothing that was really surprising. So I'm going to skip ahead a bit, though I might talk about it later when I talk about the lines that were spoken.

We see this scene and we hear Rey say "People keep telling me, they know me. No does."

Then we see Kylo/ Ben approaching and hear him say: "But I do."

I have a lot of thoughts about this:
1. I'm positive that they are saying this to each other, but don't really feel that they are saying it in this scene, or at least not this part of the scene. It doesn't really fit into the scene because as they're approaching they are getting ready to fight and you can tell that they don't really want to, yet at the same time they're ready to face each other: which is why I don't think that it belongs in this scene (I could be wrong of course)
2. This line seems a lot like some of their lines from The Last Jedi "you're not alone," "neither are you," "you're nothing but not to me," "people keep saying that they know me, no one does," "but I do," all of their lines are similar, they usually mean more than what they're saying (kind of like when Han said "I know," to Leia) and they're usually short yet at the same time have very deep layers of meanings behind it.
3. The way Rey said her line, especially when she said "no one does," she sounded a little hurt and broken, probably by her friends. So I think at some point something happens between her and the other members of the Resistance maybe they don't understand her because of her power, maybe they expect her to lead but she doesn't feel that she can, or maybe they want her to kill Kylo without trying to redeem him (it was pretty clear that that was her goal at the end of TLJ especially in the Novelization) and she may feel that it isn't right to kill him without trying to help him. Maybe she feels torn apart like her friends are telling her to do one thing, but the Force is telling her something else, and it causes a disagreement.

This location looks AWESOME! it's very Fantasy like. It actually reminds me of a location from How To Train Your Dragon 2

I'm thinking that this is Palpatine's throne... and I've never actually seen Game Of Thrones but I definitely think that this looks like it came from that series... which is awesome! (Sorry I really love fantasy stuff)

This looks like an epic battle! I think I've said this before, but I'll say it again:
I hope they go all out (with Ben not holding back like he did in the Force Awakens, just to prove to the haters that: 1. he isn't weak 2. Rey is not a Mary Sue who just suddenly knew how to everything 3. That Ben just didn't want to hurt her during their first fight + plus he was mortally wounded so... he was not going all out on her... Okay I need to get back on topic now.) Then Rey falls into the water during the fight and she doesn't know how to swim since she grew up in the desert + she could have knocked unconscious during the battle, so Ben jumps into the water to save her and that's what sort of begins his redemption arc.

Now, to the C3-PO scene.
Okay I might be wrong and I really hate to even say this but I don't think he's going to survive The Rise Of Skywalker. (One reason is because the actor can't do it forever and they probably don't want to replace him.) It kind of seems like he might actually sacrifice himself for everyone else which is really sad, and would actually make C3PO have one of the best character arcs in Star Wars (Not as good as Anakin but...) he would go from being the character who's always running away, a bit selfish as he's usually more worried about his own safety than everyone else's to the character who sacrifices himself for everyone else.
And if I'm right about this his line "taking one last look sir, at my friends," is just going to be really sad, I'm probably going to cry.

(Sorry this screen shot is blurry)
This looks like an epic scene! Episode IX looks very fantasy - Medieval with the horse like creatures and a character that uses a bow there's just a lot of Medieval- fantasy elements. Which is why.... sorry Star Wars fans... I like the prequels and the sequels better than the originals they have more Medieval ~ fantasy elements which is what I love about Star Wars. Once again I'm sorry but I think that everyone has a right to have their own opinion especially about which Star Wars trilogies they like best. Why do Star Wars fans want to argue about it all the time? I mean we're all a part of the same fandom so obviously we already have one thing in common, we like Star Wars, so why can't we get along? (No one's really started an argument with me about it here but amino is a different story)
Back to the trailer

I love how the words "the story lives forever," overlay with Rey and Ben.

This scene is one that got me really excited, for reasons that will surprise you.
So, of course I'm excited because Rey and Ben are fighting together but honestly I'm really curious about what they're fighting.
At first I thought that it could be Palpatine, but I'm not sure because of the way it shatters.
So, I have this theory, which is a bit far fetched. It sort of looks like Darth Vader's helmet from the Force Awakens, only full body. So my theory is that there could actually be an Anakin Force ghost in Episode IX, but also a Force ghost of Darth Vader who serves Palpatine. And perhaps to bring balance Rey and Ben have to defeat the Force ghost of Darth Vader and defeat Palpatine with Anakin's help.
This is kind of based on one of my other theories that Anakin caused the Force bond between Rey and Ben, and he used his lightsaber to call Rey to the Light Side and Vader's helmet to call Ben to the Dark Side, so that they could bring balance.

I just put this picture here because Ben is awesome and he's my favorite character

This looks like Rey standing before Palpatine. I'm thinking this is going to be something like The Return Of The Jedi. Palpatine trying to turn her to the Dark Side.
Maybe Kylo joins Palpatine and is standing at Palpatine's side, but then he betrays him to save Rey (something like Anakin/ Vader and Luke in the Return of the Jedi)

I have a few theories about this image
1. Rey is seeing someone's Force ghost: Anakin, Luke, Leia, or Ben
2. She is looking at Ben just after he turned to the Light Side
Because it looks like there are tears in her eyes, but she's also slightly smiling

Please share your thoughts about the final trailer!