If you can… you can try to read
The Workings Of Kamma By Ven Pa-Auk Sayadaw. This will explain quite a lot. It is strongly based on Classical Theravāda. It is a profound book on kamma. I think it is good to also read the jātaka and the Buddhist Legends. These often show how cause and effect works, especially the Buddhist Legend stories that have “Story of the Past” sections. Jātaka often explain the habitual nature from life to life that exist today. Start with Buddhist Legends before reading Jataka.
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