Where is the Higgs Field? I get the idea of how it works but I couldn't find anything explaining where it is.
This question is similar to "where is the electromagnetic field?" And the answer is: the electromagnetic field is everywhere; it exists at every point in space-time, but it simply happens that its average value is zero (or close to zero) at points far away from charges, currents, and waves.
The Higgs field, like the electromagnetic field, is a quantum field, but it differs from the electromagnetic field in two major ways. First, the Higgs field is a scalar field; so unlike the electromagnetic field, it doesn't point in any direction; it's just a single number at each point in space-time. Second, the vacuum expectation value of the Higgs field is nonzero, so even when you are far away from everything, the Higgs field has a nonzero value. So in some sense it is even more "everywhere" than the electromagnetic field.