The skeleton of a bird wing. Places of attachment of various groups of flight feathers are indicated.Bird wings are paired forelimbs in birds, which evolved specialized feathers to generate lift and thrust and allow the birds to fly.
Wing trimming does not guarantee your bird cannot fly but only reduces or limits flight. Some birds are still capable of flight with completely clipped wings and other birds can get some distance in a downwards glide.
What camera settings work best for photographing birds with open wings? Do different bird species have unique wing display patterns? How can I encourage birds to display their wings in my backyard? Whats the difference between primary and secondary flight feathers in wing displays?

When in flight, a bird's wings are capable of acting like an automatic suspension system, dampening the effects of turbulence even in stormy conditions. Working with a trained owl, British researchers found that birds change their wing shape and posture to essentially 'reject' gusts of wind.
Better Flight [Forge] Flap your elytra wings to fly higher!

Such details provide a deeper understanding and appreciation for Trimming Bird Wings For Better Flight Survival.
...
If the wings are to be trimmed, trim the wings for functionality and not for style. So many birds come into the shop here with the flight feathers intact, but the secondary feathers clipped off.

Furthermore, visual representations like the one above help us fully grasp the concept of Trimming Bird Wings For Better Flight Survival.
You have been recording many of the birds' physical traits, including the length of both wings. You observe that for 80% of individuals measured, the length of the left wing is not significantly different from the length of the right wing (in other words, they are symmetrical).