Where to get a TEFL/TESOL?

So I want teach English in a foreign country, therefore I hear it is best to have a TEFL/TESOL/CELTA certificate. However, I don't know were you would get one. Also I am a senior in High school planning to go to College and get a BA degree in Chinese or Japanese. Also I am AP Chinese and AP Literature student,... show more So I want teach English in a foreign country, therefore I hear it is best to have a TEFL/TESOL/CELTA certificate. However, I don't know were you would get one. Also I am a senior in High school planning to go to College and get a BA degree in Chinese or Japanese. Also I am AP Chinese and AP Literature student, if any of that information matters. So is the certificate something you get in college, online, or some coarse offer somewhere? Also I hear TEFL, TESL,TESOL, & CELTA are basically the same thing, in that case which is the best or which is the one you would recommend me getting.
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