Griptape

For skateboards, longboards and mini-cruisers there are a ton of different types of grip tapes in different categories of roughness. Most grip tapes come in a medium roughness, which gives you a firm and good grippy stand on your board.
Not all mini-cruisers have grip tape, especially the ones made of plastic, and some longboards got a layer of glued sand on the board instead. This is another technique that gives the same grippy stand as more ordinary grip tape do.