As opined by Fiona Flynn, our TV editor, 'El Camino: A Breaking Bad Movie' was a well-made if somewhat unnecessary epilogue to 'Breaking Bad' that wrapped up a series that was pretty much already wrapped up.
The final moments sees Jesse, after finally gathering together enough money and shooting dead the very people who built the cage that kept him hidden, emerging from a truck in Alaska. The opening scene introduced the idea of Alaska, seeing as how the "after" of Jesse was never discussed in the series proper.
More than that, though, 'El Camino: A Breaking Bad Movie' wraps up all of Jesse's business in a way that not only plays with the show's own mythology, but the character's own story. As Mike tells him plainly and somewhat morosely, there is no redemption for people like them. They simply have to start fresh, somewhere else.
As Ed, played by the recently departed Robert Forster, quizzes him on his new identity and his new life, we see Jesse hand him a letter that he reads briefly and hands back to Jesse to seal up. The letter is addressed to Brock Cantillo. While that name may not immediately ring a bell, it was a big part of the series and the reason why Jesse remained hostage by the neo-Nazis.
Brock Cantillo was the young son of Andrea, Jesse's former girlfriend whom he met in Narcotics Anonymous in the third season. In the fourth season, Walt poisoned Brock with blueberries in order to make Jesse turn against Gus. Jesse then confronts Walter about it, arguing that he must have poisoned Brock in order to spite him and that he used ricin, a highly potent poison that he and Walter made together.
Walter then manipulates Jesse into believing that it was Gus, not him, who poisoned Brock and the two then find the ricin they made earlier in the season. The ricin was ultimately given to Lydia, who was the poisoned woman referred to in the news segments of the movie.
The penultimate episode of the fifth season saw Todd shoot her dead while Jesse was forced to watch. The neo-Nazis then promised they'd do the same to Brock if he didn't cook for them. This point was also impressed on Jesse when Todd took him out of his cage to help dispose of the cleaning lady, telling him that he'd "have to visit the little boy" if he tried to escape.
Really, what 'El Camino' and its ending was about was Jesse not necessarily forgiving himself, but knowing that if he's to continue living, he has to put his past behind him and move on. That his final act, before setting off, is to send a letter to the boy, the whole reason he remained imprisoned, is him letting go of it all and starting over, not setting things right.
That part, as Mike told him, can't be done. Like Jane tells him in the final flashback of the movie, following "wherever the universe takes you is a terrible philosophy."
Jesse has to make the choice for himself to start over - and he does.