Why does salt or sugar does not dissolve in kerosene?

Kerosene is a mixture of different hydrocarbon molecules, which are non-polar: they share their electrons equally throughout the molecule, and all electrons in the molecule are involved in bonding. Salt and sugar are polar (attractive, like a magnet) substances. In the case of table salt, it is an ionic compound (NaCl), and each of these atoms has an electric charge from too many or too few electrons. Sugar has oxygen atoms in its molecular structure, and these atoms have four electrons that are not involved in bonding. Although the molecule is overall neutral, these electrons serve as a kind of polar source.

Polar liquids will dissolve polar solids, and non-polar liquids will dissolve non-polar solids. However, non-polar substances will not dissolve polar substances, and vice versa. It's like oil and water: the non-polar oil will not mix with the polar water. Another good way to think about it is magnets. The magnet, with a positive pole and a negative pole, will only cling to certain things, like your fridge. The magnet and fridge serve as polar things, whereas a piece of glass, which a magnet will not cling to, serves as a non-polar thing.