The BMW M2 CS is what I recommend my newer friends learn how to drive in rF 2. The Radical SR3 is great as well, on account of its lack of assists. From there I would recommend Tatuus as an introduction to open wheeler handling. Between these you have your major archetypes of vehicle types handled. GT car, track day machine and open wheeler. Afterwards you can graduate to the GT3s, then GTEs, then LMPs and finally the F1 cars. Actually got a very long-requested rFactor 2 introduction video going live on Sunday which, looking back on this thread, seems like it may have come in handy a few weeks ago.