Han solo didn’t “shoot first”, he was the only one who shot, period.
Greedo didn’t shoot the wall (and miss a 6ft target sitting 2ft away), that was added (poorly) many years later for a special edition.
They changed the movie because in the interim years, George Lucas was feeling like it made Han Solo look less “noble” and more scoundrel-like.



It’s insane to me how little this narrows it down to someone who doesn’t already know who you mean.