The three real tiers
A 120-hour accredited TEFL course is the baseline nearly every employer expects, native or non-native. Typical accredited online courses are often a few hundred pounds or dollars, especially on promotion, which makes this the sensible starting point if you're targeting Cambodia, Vietnam, Mexico or online tutoring.
A Level 5 (Ofqual-style regulated) course sits above this, with more study hours and depth. It doesn't unlock a different visa category, but it does help your CV stand out in competitive applicant pools, which matters more for non-native speakers competing against native-speaker candidates for the same limited roles.
CELTA costs more and includes observed, assessed teaching practice, which is why it carries weight with European language schools, some Middle East employers, and career-track teaching jobs. For a first teaching post in Southeast Asia or Latin America, it's usually more course than you need.
