The book of Jasher is referenced in the bible. Enoch is quoted once; and Jubilees was referenced by the early church leaders a lot.. These are best understood as history books, (recommended reading) just as we have history books today. They never claimed to be inspired or infallible, nor were held up as such.
The Go-To resource in my opinion in all things dead sea scrolls related, is Dr. Ken Johnson. He has a website and YouTube channel. He writes "readable" books on many dead sea scrolls (books) sorta like cliff notes that are easy to digest by the common person. I have been listening to his YouTube channel for years.
I believe his work is some of the most interesting stuff going on in the Christian community right now. Many other Prophecy Watchers agree.
He pieced together from dead sea scrolls the original calendar the Jews were using prior to Babylonian captivity, and has a digital version on his website. It was a 364 day calendar which is divisible by 7 and 52 allowing for every festival to consistently fall on the same day of the week. They had a leap week every few years to compensate for the 1.25 days short each year.
The calendar issue was one of the main issues to split the Essenes and Pharisees. The Jews were forced to use the moon based system of the Babylonians when they were conquered by them. and taken as slaves back to Babylon. After being freed, they were supposed to go back to the original 364 day solar calendar that was in use since the time of Adam. But, they didn't which caused a division.
Most people are unaware that there are hundreds of dead sea scrolls, many of which are just now becoming available. " I found "Gad the Seer" to be fascinating. Most people are bored to death by this kind of thing but I find the whole topic to be utterly fascinating.
Now that we have found fragments of "Testimony of the Twelve Patriarchs" in pre-Christian era dead sea scrolls, we can disregard the critics that claimed this was a medieval work to bolster Christianity. They claimed that because the theology in the book is virtually a carbon copy of New Testament theology. (Too good to be true)
Dr. Johnson's work shows that this theology ("Testimony of the Twelve Patriarchs") was followed by the Essenes to interpret scripture, while the Pharisees used their oral tradition from all their "elder meetings" to interpret scripture.