Please teach me the way

What do you mean by "a lot"?
If you try to only focus on cars having a role and the very visible background ones, it will be better than trying to add every car of the movie/series.
You often add too many cars: not all background cars are interesting.

How many? By new contributions waiting

@ChaserX - my approach is to watch the film in real time. If you think about what the mission of the site is, it's about highlighting and identifying vehicles a normal viewer might notice and wonder what it is. We therefore try to satisfy this conceptual curiosity. If we do, that's job done.

So if a car is noticeable, it's valid. If it's not noticeable ("background") it's more vulnerable. If it's onscreen for a long time, unusual, rare, exotic, surprising, something where the same car keeps popping up in different films, or we suspect might be deliberately included, then it would probably be acceptable. If it's just something accidental and boring which just happened to be there and only briefly seen, forget it.

As for number of pictures added as comments, match this to the number of times it's seen and its role. So for instance a TV series with several episodes where the lead character keeps driving the same car and it's frequently seen (so deserves 3/4/5[*]) - it can get several pictures, maybe as markers for each episode where it's seen. Sometimes this is useful to show substitutions/replacements. Details showing badges, lights, registrations, wheel formats helps pin down IDs. Sometimes cars get damaged and miraculously repair themselves during chases, so it's fun to spot these.

But otherwise don't post lots of comment pictures of ordinary things with minor roles - they don't help anyone, or add value to the site. Instead they just clog it up. So focus on interesting and noticeable, and either discard or only briefly include anything else.

That's been my approach over the years, and no-one's jumped in and told me I'm doing it wrong, so if you do similar, you'll probably be OK. If Antp or other admins want to comment further, that's fine - we are a fluid and friendly collective and try to adapt as we can.

You can add max 100 vehicles across 5 different movies.
If you want to add more, you have to wait that an admin validates some.
If you only have one movie pending, then you can add max 150.
That's already a lot.
Some movies may have more vehicles, in such case you have to wait for validating the first part.
But often if you do not add too many background cars, it should be enough.

When did that get updated?

It's supposed to be like this

Pictured By night cub

The change was made after you added over 600 entries in one day, followed by another 500 the next day. It was overwhelming to the validating admins. We have been telling you time after time that you are adding too many background cars. And the fact that we delete a large number of what you submit, we would hope you would learn to edit yourself, but you have not.

Not too mention I just spent a few hours cleaning up a ton of duplicate and unneccessary entries of obstructed and same or similar background vehicles.

What kind of car is it?

Every entry needs adjusting. Very tiresome. You list the years of manufacture when most cars utilize the model year system.

You screen cap so many obstructed vehickes that do not need their own pages. We don’t need every single vehicle that appears in every show or movie.

Cap the most visible and a few backgrounds. We don’t need 10 entries for 2010 Sonata 1 star YFs. Obviously higher roles can be separated but I just mered 6 entries in one series. Totally overkill and not needed to have so many open pages.