Information about TEFL courses online (Valencia)

Helllo everyone,

Does anyone have experience with this type of course? I am preparing to teach english for example at schools or language academies but as I am not native english speaker (I am Dutch) I need to do a TEFL.

I need some orientation in making the right choice between the different courses that are offered online.

Any advise or information is welcome, thank you for your time!

Kind regards,
Aline