This depends on a few factors: your level of experience, where you want to teach and what your budget is. If you don't have any teaching experience and you want to give your CV a boost, we'd definitely recommend taking a Level 5 Course or Diploma. The same goes for if you want to teach in more competitive locations, such as, Japan, South Korea, the UAE or China.
If you'd like to volunteer as a TEFL teacher or you want to teach in less competitive locations like South America or Thailand, a Level 3 Course may be enough. However, if your budget can stretch to it, we always recommend a Level 5 Course if you want to make yourself a competitive job candidate and get the most comprehensive TEFL training.
Alternatively, if you want to teach English online
, any of these Courses are suitable! However, if you want to make your CV pop and give yourself the best chance of employment in a well-paid role, opt for a Level 5.