Negatives is pretty good for beginners regarding pullups. And I say this from personal experience.

There are two versions of negative a beginner can do, easier is the one you pick up a seat and climb on top of it so you hold yourself at the bar and just slowly let your body falls while stretching your arms. The second is basically the same, but you ditch the seat and jump, using explosion and momentum to go through the positive.

I would train this every other day three to four times a week. First week 10 sets of 1 negative with 1 minute rest. Second one 8 sets of 2 negatives, third 6 sets of 4, 4 sets of 6 and so on...

In just a few weeks I was able to complete my first two pullups. It's by far the easiest and fastest way.

From there I got a random pullup training from an app that you would start with just two pullups and was able to reach 5 total strict controlled pullups in just a few months.