J- cuts and L-cuts are similar but different. Bydefinition, J-cuts are scene transitions where the audio of the next scene precedes the picture change. In an L-cut, the audio carries over from the previous scene into the following one, despite visual changes.
J and L cuts are used to create a scene that intriges the watcher into what is going to happen next. Can you hear rain? Is it going to rain in the next scene? If you bring that well known sound earily, it perks the watchers interest.
The most important thing I learned J and L cuts is that I have seen them many times in movies and tv shows before, not realizing that they were J and L cuts. It’s crazy to think about what goes into film making and the editing process.