How to use OR operator to match either of given regex or keywords | how to grep two words | grep

How to use OR operator to match either of given regex or keywords (how to grep two words)

Cat sample.txt | grep ‘she’ Cat sample.txt | grep ‘two’ Cat sample.txt | grep –E “she|two”

#grep-E (either one of the keyword) ... https://www.youtube.com/watch?v=vREd2SFofqk