Coursera offers many different courses for free
The Commonwealth Education Trust
The Commonwealth Education Trust offers a free and recognised online teaching course through Coursera. There are 8 modules that require an average of around 4 hours per week with 1 module a month. On completion, participants can request a certificate and with such prestigious names and Cambridge University behind it, this course is sure to make your teaching life a whole lot easier. The course is not subject-specific so it's suitable regardless of what content you are teaching.