So lemme explain some terms I use in my reviews. This list can be updated at any time, if you find a term you dont understand: ask me! I'd be happy to explain and add to this list!
Credits- theres a few things here.
First: most things have TWO sets of end credits, in addition to the beginning credits. This stays true for most every kind of movie or anime.
Second: I mainly refer to the first credits, when an episode or movie ends, sometimes theres an animated or stylized set of credits, before the white lettering on black background which most people think of when they hear "Credits"
So an explanation of why I mention credits. Sometimes, after the stylized first set of credits, theres a bonus scene to either wrap things up or set up for a sequel. In an ongoing show (such as My Hero Academia), this scene is replaced with a teaser for the next episode.
This is most common with Anime, but also happens in some movie series. For example, Twilight: Breaking Dawn pt 1, has a teaser for part 2 after the first set of credits (trust me, my mother screamed in excitement seeing that in theaters so I know)
This comes with a tip: if you're watching a show, watch after the first credits to see either a teaser for the next episode or a bonus to the episode you just saw. Do this for Marvel shows too, this bonus scene is how they announced Loki was getting a second season. Falcon and the Winter Soldier also has bonus scenes like this so keep your eyes open and dont skip ahead.
With movies, watch at least until the white credits on black background. Personally I watch through all the credits to be safe, though I've never seen anything past the formal credits.
Keep these in mind mostly for anime or media with confirmed sequels. Like movies based on books, such as Harry Potter or Twilight. Or shows and movies that link together like the MCU. Maybe even go look back at stuff, might find an extra scene!