Ask HN: I want an app that can help me find back my memories by entering keyword

Do you have the same experience like me? When something come into my mind(for example, "waht is survivorship bias"), it's so familiar, but just don't know where I have read it, that feeling is too bad! I'm not a smart guy, and I don't have the ability to remember all things I have read. So, I'm want to kown if there's a tool that I can put all things in it(articles, videos, images, podcasts, etc. I don't want to manage them, just want a place to throw them in), and when I input a keyword like "meditation", it will offer me the sources I had put in. I think the difficulities is to parse the videos, images and audios instead of text files.