There's only one way to spell "hello" correctly: H-E-L-L-O.
However, you could try to be creative and spell it differently using:
* Misspellings: like "helo," "hallo," or "hellow"
* Acronyms: like "H.E.L.L.O."
* Symbolic representations: like using emojis or other symbols.
But in terms of standard English spelling, there's only one way to spell "hello."