For me like is for unimportant posts that amuse me or to show support (like my fave celeb’s photo dumps or updates) save is for important stuff like recipes, relatable quotes and tips that I might need to go back to. Pretty sure everyone has soo many likes from before IG allowed save function and it’s a fuss to look for something old that you liked years ago in the catalog. Save is much more convenient as it can be categorized