This PPT is the first in the series of teaching methodologies for pre-service teachers. It is designed for English as a Medium of Instruction. It could also be of help for those studying Applied linguistics, TEFL, TESOL, TEYL, and Pedagogy. One PPT will be uploaded each week (Sunday) Teaching Theories. Pieces of information mentioned in these slides are adopted from https://nios.ac.in/media/documents/dled/Block1_502.pdf