It also has Luke starting on a desert planet, with an emphasis on gathering water. His family is killed, leading to the start of his journey (though this is common in storytelling in general, so it could be from a million other places).

The force has some similarities to the pseudo-magical aspects of Dune, with a heavy focus on meditation and understanding your body and the universe. (Both the Bene Gesserit and Mentats have forms of This. BG are more internal-focused and Mentats external.)

Im sure there's a lot more that could be pointed out. That's just a small list off the top of my head.

Any of it could be argued as coming from any number of sources. After all, Frank Herbert was inspired by other sources to create his world too. The desert planet was inspired by his experience with dunes. The religion and cultural stuff are all inspired by real life religions and cultures. None of it is from nothing.

No one has ever had an original idea. It all comes from other aspects that we absorb in our life. Lucas didn't "rip off" Dune. He certainly borrowed pieces from it though, along with a lot of other media, sci-fi and otherwise.