I forgot to mention: The suttas on Paṭicca Samuppāda are in the Sutta Pitaka, not in the Abhidhamma section.
The main series of those suttas start with the “Paṭiccasamuppāda Sutta (SN 12.1)“.
However, especially for those just starting to understand Paṭicca Samuppāda, reading word-by-word translations of suttas is not likely to be helpful. That is because suttas are in a highly-condensed form that requires detailed explanations.
– See my post, “Pāli Canon Is Self-Contained but Requires Detailed Explanation”
I recommend reading the recently detailed explanation: “Paṭicca Samuppāda During a Lifetime.”
– I will start on a few posts to simplify that analysis with some examples in the next post.