In college, I used to study Japanese using the Genki textbooks which categorized verbs as u-verbs, ru-verbs, and exceptions like kuru/suru. I recently started attending a language school that uses a textbook called Daichi which seems to use the same verb categorization as Minna no Nihongo (Group 1, Group 2, Group 3).
Essentially, how do the Genki categorizations translate into the Daichi/Minna no Nihongo categorizations? I understand that group 3 is the exception verbs but keep confusing groups 1 and 2. Also I am aware of the concept of godan and ichidan verbs (I know that u-verbs are godan and ru-verbs are ichidan) so if you could use those terms to explain it to me, that would be helpful.
by softlysleeping_