You may have read some negative things about online TEFL courses, but do you know why people are saying these things and what the actual research is?
First you should know that all online TEFL courses are not created equally. Yes there are apparently many low quality courses out there, but that's not all.
Let's look at the problems.
Problems and opinions w/ online TEFL
First I'll let you know about some of the common opinions and problems w/ online courses then we'll go over these in more detail and finally you'll see what the actual research is.