Hey, im new to maya and im following this tutorial.

Im extruding faces however there's this one part i cant seem to do and its giving me a headache.

each time i choose a face, the edges will be highlighted yellow and so will the nearby faces which are highlighted red. When i select one face and then transform its size, itll affect the whole surrounding areas including the red edged faces and i dont want this to happen

how can i just transform the size of the face that i selected without having the nearby faces transforming along side it?