Suggest best workshops/tutorials on product discovery

I am looking for best workshops/tutorials on product discovery.

Any thoughts/courses/workshop past experiences and thoughts would be highly appreciated and help me in saving time and cost. If you share the links to the courses/workshops that would be added bonus for me as I am looking for the most cost effective course that is good for me.

Thanks in advance

Try niche pursuit insider (A Amazon FBA course) available on this surprisingly helpfull fourm. Many very thanks to its founder Sir SAM