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The Forward and Sideslip are the same thing. These are cross control maneuvers that cause the airplane to fly sideways. In a cross wind, if you slip at the same rate that the cross wind blows, you can fly down the runway and still be pointed down the runway. This allows you to touchdown without any side load on the landing gear. This is especially important when flying tail wheel aircraft.
In a crab, the airplane is coordinated and flys normally. However, if you have a cross wind you need to point the airplane up wind in order to track down the runway. If you touchdown like this, there will be a side load on the gear that may damage the airplane or cause a groundloop in the case of a taildragger. If you use this technique, you need to learn to kick the rudder just before touchdown to align the airplane with the runway. This takes good timing. If you kick the rudder too early the airplane will begin to drift with the crosswind and if done too late it will hit going sideways.
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