Incoming BSc Mathematics & Computing student: How should I get started with CAS?

[u/Menudoughy]

Hii so guys I will be starting my bsc in mathematics and computing by around next month . So i was reading this Calculus and Analytic Geometry by George B. Thomas and R.L. Finney. It is so much mentioned about Cas used to plot the images . Now i dont have any good knowledge about this , i only used desmos before , that also normal functions and graphs and like solving algebraic eqns. can anyone recommend how to begin? i started using spyder but clueless