The biggest mistakes Neo has made in The Matrix series

The Matrix is complicated by the fact that everything Neo (and everyone else, for that matter) does is predetermined. No matter what he decides to do, he already did it, because his path was already mapped out.
Things get even more complicated when Neo’s existence as “The One” is factored in. Neo is killed by Agent Smith, but because the first Matrix covers its simulated tracks, his death needed to happen for Neo to become The One. He dies, then comes back to life, fully embracing his destiny. This is made evident when Neo stops bullets and sees in code. He also steals a play out of a ghost’s playbook by jumping inside Agent Smith and then exploding him. This is cool, but also turns out to be a mistake.
We come to find out that this act sets Agent Smith free, making him a lethal computer virus who can multiply. Other agents, in comparison, can only occupy one vessel at a time. Agent Smith is now able to take over the entire Matrix. This becomes a temporary solution when Neo makes a deal to destroy Agent Smith, leading to a treaty that ends the Machine War — but really, that was just luck. Smith could have easily destroyed everything, all because Neo blew him up.
Original Source