What are the differences, characteristics and learning order of Chess and Plum Blossoms, Orange Secrets, Romance and Elegance? Ask chess friends for advice?

Plum blossom spectrum mainly talks about the layout of the wind curtain horse as the back hand (defensive counterattack), and the secret of orange mainly talks about the layout of China artillery as the first hand (offensive), in which the endgame part is the actual endgame part of Yi Shu's elegant music, and Yi Shu's elegant music mainly talks about arrangement and actual endgame. These three books are for beginners. We must master the endgame, and the killing method is worth learning. The first two are compulsory, but the layout is basically outdated. It's good to know, don't be too addicted to subtle killings. Personal views are for reference only.