It is Newton's three laws of motion that are the key to the explanation (not Bernoulli's Principle, which partially correct but overly simplistic.)
Newton's Three Laws of Motion
Newton's Three Laws of Motion in Plain English
Ultimately, what best explains what gives wings lift is that the wing must push a lot of air down.
What a better way to explore flight than by making paper airplanes. Here are some straight forward instructions:
Harder:The Tail Spin