Present simple vs.Present Continuous

Could you please help me: what is the best way to explain the difference between Present Simple and Present Continuous Tenses using the topic of "Travelling" .The learners are adults (Elementary).
Thank you very much in advance!
Welcome to English Forums!
I would start with the cases where the two are most different. The simple present to indicate habitual action (I go to Moscow every week on business. I often travel to Germany.) vs. the present continuous to indicate activity occurring while the sentence is being uttered (I am on the train. I am going to Moscow. I am traveling by train.)
Thanks a lot!