Since you have read jude:1 maybe you should read the book of enoch believe it is book one : the watchers which jude quotes from.  "As in the Days of Noah"  Warning it is not easy to understand need to know biblical symbolism, how to figure out prophecy, or other methods like trying to put yourself in the shoes of an ancient person trying to explain something he did not fully understand, and how to puzzle out missing fragments. Would not try to  decipher too much from the book without a decade of intensive study at least or a couple too few decades of casual, or the Holy Spirit.