Jean-Luc David gave a talk about building products in 24 hours by focusing on real problems, using Maslow's hierarchy of needs to guide vision. He emphasized the importance of not overplanning, building something quickly to test assumptions, and finding the right team of a backend developer, frontend developer and designer. The talk provided advice on tools, naming the product carefully, deploying, crowdfunding, and growth hacking through homework and persistence. David took questions at the end of the talk.