transition to product management

i am an aspiring PM .Currently i work as project manager and design project roadmaps.How do i transition to Product role.I keep reading blogs in medium,follow podcats ,an active member of a product slack community but i dont think I know the jargons right or can crack the design interview.I have looked at product school courses but i want more intervoew prep focussed and practical experience rather than theory.Any blogs/must reads welcome