After fulfilling the basic requirements to obtain partner visa to Australia. You must know that partner visa falls to 3 categories:
The main difference of Offshore and Onshore visas is your location when applying, you must live outside of Australia for offshore visa while onshore pertains to living within Australia upon application. Lastly, Prospective Marriage Visa or fiance visa is for those planning to come to Australia to marry their prospective spouse. In planning to obtain any partner migration visa, you should know all requirements and classifications.