Church document link:

Vatican Official Website (Holy See) – central hub for all official texts: Vatican.va
🔗 https://www.vatican.va/

Catechism of the Catholic Church (English, official text)
🔗 https://www.vatican.va/archive/ENG0015/_INDEX.HTM

Second Vatican Council Documents — all constitutions, decrees & declarations
🔗 https://www.vatican.va/archive/hist_councils/ii_vatican_council/index.htm

Code of Canon Law (1983) — official Church law
🔗 https://www.vatican.va/archive/ENG1104/_INDEX.HTM

Compendium of the Social Doctrine of the Church
🔗 https://www.vatican.va/roman_curia/pontifical_councils/justpeace/documents/rc_pc_justpeace_doc_20060526_compendio-dott-soc_en.html