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J=L+S,…,|L-S|. So J=2 means L and S are parallel and pointing in the same direction for them to sum up; J=1 is when L and S are perpendicular, which you can see as only S or L contributing to J and thus J=1; J=0 means L and S are antiparallel (parallel pointing in opposite directions), which in this case where the L and the S vector have the same length, then the sum of those vectors being antiparallel will give a vector with length 0, so J=0.
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