Skilled Worker visa applicants need a valid passport, certificate of sponsorship, proof of English language ability, criminal record certificate, and professional qualifications. Any non-English documents need a certified translation.
The Skilled Worker route used to be called Tier 2 before the 2020 rebrand. You need a UK job offer from a licensed sponsor, plus a supporting document pack. Which documents face scrutiny depends on the role, salary, and country. A software engineer joining a tech firm has a different document mix than a nurse joining the NHS, or a doctor joining a private trust.
Professional qualifications carry extra weight in regulated professions — healthcare especially. GMC for doctors, NMC for nurses, GDC for dentists, HCPC for allied health. None of these bodies will register an overseas qualification without a certified English translation. The standards they apply are tighter than UKVI's.