If it is "real" wood like the old kind then you have to nail it using a nailer. If it is a new kind then it probably will fit together in a groove along the side. You will then "tap" the edge to be sure that it fits tightly. There should be a video or at least an instruction sheet from the flooring company. Be sure to put a barrier between the concrete and the floor. They sell these at Home Depot or Loews. The glue was used on the first wood floors designed for the do it yourself market. For those you would put glue on the end/side then fit it to the next piece then use straps to hold it tight until it was dry. These took a lot longer to install. (Can you tell we have done a few floors over the years!)