> I feel like white lines are almost always ok to drive over…
Single and double solid lines parallel to the flow of traffic, of any color, almost always mean "do not cross".
A single dashed line, or a double line where one or both halves is dashed, can be crossed under at least some circumstances. The rules for crossing these vary depending on context, e.g. one-sided passing and center turn lanes use similar markings but with the solid and dashed lines flipped. (You pass from the dashed side but enter the turn lane from the solid side.)
White lines separate traffic going the same direction. Yellow lines separate traffic in opposite directions. This is independent of whether the lines can be crossed.
Single and double solid lines parallel to the flow of traffic, of any color, almost always mean "do not cross".
A single dashed line, or a double line where one or both halves is dashed, can be crossed under at least some circumstances. The rules for crossing these vary depending on context, e.g. one-sided passing and center turn lanes use similar markings but with the solid and dashed lines flipped. (You pass from the dashed side but enter the turn lane from the solid side.)
White lines separate traffic going the same direction. Yellow lines separate traffic in opposite directions. This is independent of whether the lines can be crossed.