[Koha] Athena to Koha

[Gyaneshwar Narayan]

Good afternoon from Fiji

May I ask if anyone has done a migration from Athena 9.2 to the Koha???
If yes, then is there a documentation of the steps used???
Also, is there a PDF or webpage I can view to help me in doing cosmetic changes to the Koha site and the OPAC???
In addition, is there a list of all the features of Koha???
Sorry about asking so many questions but could anyone help please.

Regards.