It depends on which way the wind is blowing. Aircraft always land and take off into the wind.
Mostly they do, not always. It is more efficient to take off into wind.
It's safer to land against the wind. When you do that, the wind speed is subtracted from your air speed to equal your ground speed. Just before you touch down, the ground is whizzing by under you slower, and after you touch down, you need less distance to slow down and stop.
If it can be helped always land and take off into the wind (wind in your face)
Airplanes land in the direction of the wind because it helps increase lift and control during landing. Landing into the wind reduces groundspeed, providing a shorter landing distance and better control of the aircraft.
Pilots always land and take off upwind (the wind is coming from straight ahead, or nearly so) Downwind is the opposite, when the wind is coming from behind. In order to tell, you can look up winds online (aviation weather dot gov) or look at the wind socket at the airport.
Yes, airplanes always fly into the wind. It decreases the length required to takeoff because the net airspeed over the wings is higher. Logistically though, sometimes airports won't swap directions for a wind speed that's relatively small.
Wind strength or wind speed is important to a pilot because it effect the pilot's ability control the plane while in flight, upon take off, upon final approach and upon landing.
If conditions (airport layout and traffic conditions) allow aircraft take off and land against the wind (headwind). This way the aircraft can take off or approach the runway at a lower ground speed.
Wind.
Wind
It is difficult to ride a bicycle against the wind because of the pressure the wind puts out. If the wind is blowing against you, there is a resistance that makes it hard to go against.