Most Helpful Guy
If you watch Mockingjay Part One, you should be able to understand it in a general sense.
However, I recommend watching all three movies, as all of them were pretty entertaining.
It's a shame that the Hunger Games' popularity faded away with all the other YA movies trying to grab some cash. (Although, splitting up the finale is a HUGE cash grab in itself)
In short, just watch all of them. You'll have a better experience overall. If you don't have the time, watch mockingjay part one, and you should be good.
Best of luck to you👍
Most Helpful Girl
I liked the first one the best, I feel like they slightly went downhill movie-wise from there.
The only ones you're missing is Hunger Games, Catching Fire, and the first part of Mockingjay.