CW structure of $S^n\times S^n$

Question

I am recently studying cellular homology but I am not very familiar with the CW complex. To compute the homology of $S^n\times S^n$, we can check the CW structure of $S^n\times S^n$ that has one $0$-cell, two $n$-cell, and one $2n$-cell. How do we derive this CW structure? I only know how to do for $S^1\times S^1$, that is, we can write down the labeling scheme for $S^1\times S^1$.