Right! The best thing about our chosen career is that it's completely impossible to know everything - there's always a new corner of software engineering to dig into, be it how the Linux kernel works, or programming with Haskell, understanding Transformer LLM architectures, or how the Svelte compiler works or whatever.
Programming is about finding the answer. If you already knew everything, you could just sit down and type any program from your knowledge.
We all know that you can't know everything otherwise, why even write documentation or use git?
Unfortunately, it's difficult to move past this idea, and it's so pervasive that stating "I don't know" can negatively affect your standing for some.