Are You Ready to Draft Your Plot?
Plot is what happens to your main character (MC). Things happen and your MC has to deal with or resolve these issues: they receive a mysterious message, they come home to find their spouse in bed with someone else, their house burns down, etc. One thing happens, then another, then another, and each event leads your character further along your narrative arc toward the climax.
Plot is what gives us action. The narrative arc, working in tandem with the character arc, gives us the reaction.