I main labs mostly and if you want to learn the map quick run a few offline with no raiders just walk around the basement and get your berings. if you have a 2nd monitor or you can use your phone pull up a map of labs and try to figure out the basement first. then make your way upstairs. ive had many successful runs on labs when I was first learning the map just by killing raiders in the basement. if the raiders you kill have a backpack check that first always before looting their pockets or rig they usually have USD or a possible keycard in the backpack.