In the Book of Changes, there is no mention of "One Yuan, Two Instruments, Three Talents, Four Symbols, Five Elements, Liuhe, Seven Stars, Bagua, and Nine Palaces"
These are just theories and nothing much. . . . . . . . . .
Yiyuan (Taixu)
Liangyi (Taiji---the two qi of Yin and Yang)
Three talents (Heaven, Earth, Man)
Four Symbols (Taiyin, Shaoyin, Sun, Shaoyang---wood, fire, metal, water)
Five Elements (wood, fire, earth, metal, water)
Liuhe (four directions up and down---six directions, generally refers to the universe or the world)
Seven stars (no---the Big Dipper is: Tianshu, Tianxuan, Tianji, Tianquan, Yu) Heng, Kaiyang, and Yaoguang are counted as one;; there are seven constellations in each of the twenty-eight constellations in the southeast, northwest, and they are not taken out separately)
Bagua (Qian represents heaven, Kun represents earth, and Kan represents water) , Li represents fire, Zhen represents thunder, Gen (gèn) represents mountain, Xun (xùn) represents wind, and Dui represents Ze)
Nine Palaces (i.e. Luoshu)
Many. Nothing is connected and has no practical meaning. What on earth do you want to learn? . . . . . .
Fortune telling? If there are many types of orthodox fortune telling, there is no need to learn them all. . . . .
Bazi (learn about Heavenly Stems, Earthly Branches, Five Elements, and you can get started)
Liu Yao (learn about Heavenly Stems, Earthly Branches, Five Elements, and Bagua)
Easy to Count Plum Blossoms ( I Ching, Heavenly Stems, Earthly Branches, Five Elements, Bagua)
Qimen (Heavenly Stems, Earthly Branches, Five Elements, Bagua)
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Your question is too general
Please tell me what you want to study specifically and I will recommend books to you. . .