iOS 17.5.1 yet still can’t copy and paste sections of text lol

Probably because you aren’t doing it right→Select, cut, copy, and paste text on iPhone - Apple Support

That's right! you must copy the whole text and paste it in the notes or any application to select the wanted text. lol

You mean that you can’t do this?

As I just demonstrated, I only selected part of the text and was able to copy it.