Recommendations for blogs, books etc. to increase leads (performance marketing)

Hello everyone, I would like to deepen my knowledge in the field of performance marketing (in terms of lead increase, lead generation through SEO pages) and wanted to ask if anyone here can recommend blogs, books, etc.? I have been working in SEO for a few years now and of course the URLs also generate leads, but there is certainly still room for improvement. Maybe someone here has recommendations?