Discrete Mathematics - PDNF and PCNF

Principal Disjunctive and Conjunctive Normal Forms of Logical Expressions.

Step-by-step tutorial:
1. How to deal with "or", "and", "if then", "if and only if", "negation"?
2. What if normal form?
3. Principal Disjunctive Normal Form
4. Derive Principal Conjunctive Normal Form from Principal Disjunctive Normal Form

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Without constructing truth table, obtain the principal conjunctive normal form (PCNF) of 𝐴 ≡
[(𝑟 ∨ (~𝑝 → ~𝑞)) ∨ 𝑝] → ~(𝑞 ∨ 𝑟)

Sir can you teach me this question? I cant find any sources that have a clear explanation for this type of questions. Thank you