Highlight content but for podcasts

Podcasts are here to stay, like many I digest 1-2 every few days. Listen and then move on. Many podcasts are 60 minutes long full of great content. How does someone go about highlight specific parts that are the most valuable or want to bookmark?
I am thinking of the age old idea of "highlighting lines in textbooks" - how can you do that and get a solid digest of the content in a condensed listen or archive of great thoughts for your podcasts?
Is there a tool that exists to do this? Sounds like a welcome idea imo