Or both, of course
Okay now, before we move on to actual techniques, let's figure out how you can use Wind with other elements, or even with features of the environment. This are, of course, not set in stone, and you can always think of more creative and useful ways to use wind, depending on the situation.
Wind is an element that provides speed. When combined with other elements, it will enhanced their speed, increase their range. Scatter then or make them faster. It is also a cooling agent to water, as it will make it colder, but not enough to make Ice or the Ice element, that requires a KG.
With fire is the same, it provides fuel, thus makes the fire stronger, hotter, and also faster and more spread out, if you want it to be. You can make a fire scatter around, for example, with a whirlwind. Take over the fire and make it move as you want to, by having it follow the wind.
You can have it push boulders, if the strengths match. But yes, wind is not nearly as powerful as Earth. But it can be ran through the ground to lift up a dust screen, or push gravel and debris towards your opponent. It can make an earth projectile faster. Etc etc.
And lightning? Since wind is an insulator, if met against lightning directly, it will put it out. But you can play with that. For example, you could make a vortex of wind and a vortex of fire. Generally, vortexes, no matter the element, work well together, as the elements move around each other in the same direction, serving only to empower each other. A lightning and wind vortex can be combined like wise, both acting to make the other faster and sharper, creating a great lightning/wind combo. For example. You could also play with areas with more scarcity of air for higher or lower resistance, so that the lightning moves to those areas, thus altering it's path. Just an idea, of course.
So, to sum it up, all elements have something they "add" to a combination. Wind provides Dispersion and Speed to all elements, while adding a few characterists properties to specific elements. (Like cooling water, fueling fire, isolating lightning, etc etc)
Questions?