The main forces of attraction that you need to know about at this level are those between a positive charge and a negative charge. If you think about a magnet, one end is a positive pole and one end is a negative pole. The postive end is always attracted, or drawn to, the negative end. This sort of attraction happens a lot in chemistry. The negatively charged electrons that whizz around the nucleus of an atom are held there because they are attracted by the postive charge of the nucleus.
Some molecules have regions of postive and negative charge - the water molecule is a good example.
Water is a liquid over such a large temperature range because its molecules like sticking to each other. Each one has a slightly positive end and a slightly negative end.