I just started spending my free time reading about JFK a few months ago. How could I know?
Let me save you some time:
Oswald did it alone.
Look, I get it, you WANT THIS TO BE A CONSPIRACY. Maybe it reinforces your world view, maybe you actually believe it, but you're lying to yourself.
I was a JFK CTer (aka: Moron) for 25 years. I read every book written between 1964 and 1996 on the assassination and I bit hard on the conspiracy. I sat through Oliver Stone's movie 6 times in the theater, and hundreds more on VHS. I even bought the cleaned up Zapruder Film.
I have forgotten more Assassination CT lore than I can recall.
Looking back there was a huge problem that I ignored (because ignoring the obvious is a primary trait of morons), over the years my prime suspects behind the assassination changed with each new book. First it was Johnson, then the Mafia, then the CIA, then the CIA with the Mafia, then anti-Castro Cubans, then anti-Castro Cubans with the Mob, then anti-Castro Cubans with the mob, CIA, and the FBI.
The motivations also changed; the military industrial complex wanted to go big into Vietnam, the Mafia wanted revenge, the CIA wanted revenge, the anti-Castro Cubans wanted revenge, Hunt oil had some kind of problem, etc...
A real crime has a narrow list of suspects.
All of the suspects I just listed were angry with JFK and his brother, but killing a President of the United States was not part of their playbook.
More importantly, there was no guarantee JFK would be re-elected in 1964. Historically speaking, Kennedy accomplished nothing while he was in the White House. Not a single bill he co-sponsored made it through the house. With the exception of the Cuban Missile Crisis he is mostly a forgettable President if one looks at his record alone, and not the hype.
There was no need by any of the suspects to kill him.
I never thought of any of these things...until I went to Dallas.
In less than 10 minutes I went from a CT-moron to normal person. Oswald had an easy shot from the 6th floor. I mean EASY. You can argue ear-witness testimony, and matrix in your interpretation of the Zapruder film frames all you want, none of these things outweigh the physical evidence, or the ballistic evidence which all points to Lee Harvey Oswald.
Like I said before, guns don't lie.