How to change image on hover over text?

Hi, using the course template, how do you change the image on the right when you hover on the texts on the left? Also, what's the best way to implement this on mobile (where there is no mouse hover)? Here's the read only link: https://preview.webflow.com/preview/geekworld-travel?utm_medium=preview_link&utm_source=designer&utm_content=geekworld-travel&preview=4f2d443bb697909b3e935615d5d363d2&workflow=preview