How can I create pseudo gliding physics?

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I would like to make a gliding mechanic that uses physics for my game, but I don’t know where to begin.

An example of what I would like to achieve: https://www.youtube.com/watch?v=k3aADqQk-1Y

( This example has some other aerodynamic factors like gusts of wind, which I don’t need. Just a simple WASD glider with fake aerodynamics. )

I have only found two threads on the forum regarding gliding, and neither of which seem to help me in my particular case.

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2

Have you tried with Wikipedia? I found this:
Three principal forces act on aircraft and animals when gliding:[19]

  • weight – gravity acts in the downwards direction
  • lift – acts perpendicularly to the vector representing airspeed
  • drag – acts parallel to the vector representing the airspeed

As the aircraft or animal descends, the air moving over the wings generates lift. The lift force acts slightly forward of vertical because it is created at right angles to the airflow which comes from slightly below as the glider descends, see angle of attack. This horizontal component of lift is enough to overcome drag and allows the glider to accelerate forward. Even though the weight causes the aircraft to descend, if the air is rising faster than the sink rate, there will be a gain of altitude.
Original Link (Go to forces)

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