There are several hoax editions of the book of Jasher, and one real one. The real one lines up well in a non-contrived way with the several references to it which survived in the Bible.
The legitimate one is accepted as legitimate by serious scholars. Are you new to this kind of study, you seem to be chapped by what is normal debate, and cite Wikipedia…. Keep digging, and… welcome to Q Research to yourself, too. Been following Q from before there was a qresearch.