As people have said, the development of heavier-than-air aviation does not depend on a single invention. Some advances were by invention, some by integration of previously existing knowledge.
Trying to decide who was the first to fly is a parlour game, which is OK until some kind of fervour, nationalistic or other, leads people to denigrate great pioneers, such as the Wrights.
You can't even establish a criterion for "practical flight," since what counts as "practical" changes in the light of existing developments. By the standards of 1903, the Wrights achieved practical flight (passage from point A to point B, in the air, not by inertia, where point B is not lower than point A, and where the aeroplane is available for re-use after only minor fettling), but by the standards of 1908, established in part by the Wrights, it was a marginal hop.
But it is interesting to learn about the progress of development, the contributions and sometimes strange omissions of the pioneers.