Apocalypse Now / Heart of Darkness

I decided to write about the ambitions that we can see in some people's character in the movie Apocalypse Now and the book on Heart of Darkness. I will compare these two and explain how some people or som ideas can take the other people's lives

Heart of Darkness

I was told that there is a movie by the name of Heart of Darkness, can anyone tell me how is this movie?
I believe that after watching Apocalypse Now, it will be easier to write on Apocalypse Now rather than Heart of Darkness. I can see many differences between the two.