Which calc course?

My friend is returning to school as an adult to get her master's but she's nervous about calc next semester. Math was my jam but it's been decades. So in an effort to be ready to help her and to find something other than doom scrolling, I have started the differential calc class. It is super basic so far but I'm not sure if that's my prior education or if I'm taking the wrong course to refresh myself. Is this course the most like what she will encounter at a calc 101 level? Either way, it's great fun to get my feet wet again! Forgot how much I enjoy school.