The basic law of conditionality - This-that Law Idhapaccayata. Dependent Origination - the First Six Links : ignorance, habits, consciousness, body and mind, and the six sense bases and contact
Continuing Dependent Origination. For further reading: PDF download - Ven.P.A.Payutto : Dependent Origination - The Buddhist Law of Conditionality. For a deeper understanding: Bhikkhu Bodhi - The Great Discourse on Causation DN15