[Wikipedia article](https://en.wikipedia.org/wiki/Poincar%C3%A9_conjecture). If you look at the top of the article, it states the conjecture with each word hyperlinked to explain what it means. I’d use that as a way to “learn about it”.
It basically says that any “[blob](https://upload.wikimedia.org/wikipedia/commons/thumb/5/52/Ricci_flow.png/200px-Ricci_flow.png)” or 3D surface that doesn’t have any holes in it, or any edges, is equivalent to a sphere, from a mathematical point of view.
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