If you are about to start a TEFL course then Learning Teaching: A guidebook for English language teachers by Jim Scrivener should be one of the first English language teaching books to consider purchasing.
It’s got everything you need to help widen your understanding of what being an English language teacher is all about. The book covers both the practicalities and the theory of being an EFL teacher. There is a useful chapter on planning lessons, and then additional chapters on teaching skills such as speaking and listening. There are also ideas on classroom activities to get your students working in pairs or groups. This all helps new teachers put together a structure for their lessons, and gives them guidance in how to fill that structure with useful and engaging learning activities.
Learning Teaching is also strong on providing resources for new teachers who struggle with the theoretical aspects of the English language. The chapters on lexis, grammar and phonology are a good reference resource for those who want to brush up their understanding in these areas before they embark on a TEFL course.
For novice teachers on their TEFL course or just starting out Learning Teaching is a real EFL bible to help guide you through those nerve racking first few months. It may also become a useful teaching reference book throughout your English teaching career.
Buy the English language teaching book, Learning Teaching here.