More locations: Now over THIRTY. More choices: special programs, volunteer positions, language classes. More security: Members of BBB, all courses externally moderated. More Accurate Info: No hand-picked testimonials, all course feedback availble online. More Support: worldwide lifetime placement assistance. More Experience-running worldwide courses for 10+ years. More FUN! ...... TEFL International
That's far too general a question.
There are thousands of schools.
Many of them teach their own, moderated, version of a course taught at many other places.
Many teach their own things.
Some are beginners weekend or 4-week courses.
Some are 2-year MA degrees.
What do you want to do with the qualification?
Where are you, and where do you want to teach?