Orthonormal basis vectors

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This video looks at the process by which an orthonormal basis is created using the basis vectors derived from the tangent space of a manifold.
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Thank for your great video
There is one question i get stuck:
why the co variant basis are orthogonal in this video or the previous video
it doesnt need to be true in linear algrebra?
thank

garytzehaylau
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Why do we use two different basis.. (Contra and covector) .... I know they behave in different ways... But i wanna know the difference in application of both of these.

sarthaktiwari
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Gradient vector is a covector right????.... While the normal on the curves are taken to be contravariant basis vector ... Why is that????

sarthaktiwari