How To Get Residency in Portugal: A Comprehensive Guide
Types of visas in Portugal: https://vistos.mne.gov.pt/en/national-visas/general-information/type-of-visa#residency
Portugal SEF: https://www.sef.pt/pt/Pages/homepage.aspx
Portugal Visa Application Form: https://vistos.mne.gov.pt/images/formulario_visto_nacional_en.pdf