I have been learning how to use Krita for a while now but even to this day I just cannot find the answer to this question. I have looked all over in search for an answer but no luck.

I have seen that in another digital art software, Paint Tool SAI they have a super cool feature called a "paint layer" it lets you modify your lines on the spot by pressing Ctrl and left mouse click you can make your lines bend any which way you want. Does Krita have this feature? I'm busting my head looking for info about this and I just can't find it anywhere. I have also spent hours looking and experimenting in Krita and just can't find it. I'm new to digital art and I don't know what this feature is actually called. But it's not the Bezier curves feature in Krita. the one on the other software actually lets you manipulate the existing line in countless of ways. Does Krita have this feature? if so how may I access it?

Thanks a lot in advance.

No, Krita doesn't have that feature.

Aw! Well, thank you very much again Sir!

I think you can do this manually by moving points on a vector layer, if you use vectors.
You can try to accomplish this using a smudge brush as well, though the results may not be as clean as you'd like.
You can also select and distort said selection, though IIRC the control is point-by-point and because of that it can be slow and unintuitive. This is probably the closest to what you're looking for though, I would guess. Maybe in a future revision, there will be brushlike controls for the select/distortion mesh.

I haven't used SAI so I'm not sure how it handles this feature, but hopefully these are close to what you're looking for.

After a bit of googling, isn't it just a vector layer? Though, playing around with it, it doesn't look like Krita's vector layers are very robust compared to Sai or Clip.