CSPO or Certified Scrum Product Owner certification is your first step on the path of becoming more Agile and master Scrum. Since product owners are closest to the "business side" of the project which makes them more accountable for the investments and ROI's, this two-day certification and training provides with a level of knowledge and expertise that is much above and beyond that of a typical project managers. It helps them define their product backlog and priorities better, ensure that the team is well-versed with the requirement and get the work done within the defined timeliness.
Brief understanding of Agile as a philosophy, and adaptiveness to change is the only prerequisite for this course
Certainly, there can be no alternative for a qualitative, in-person training from a qualified instructor who has many years of experience in Agile coaching.