new to this - what is google sge?

Search Generative Experience. It was Google's test of AI written answers at the top of the results, run through Search Labs in 2023, and in 2024 it went public under a new name, AI Overviews. So any article talking about SGE is really talking about AI Overviews now. The SEO worry is fewer clicks on informational searches, since the answer is sitting right there.