Do I have to use Cairo in order to use StarkNet, or can I use Solidity?

Using Cairo is going to be more efficient than using Solidity, so we recommend learning Cairo. However, you will be able to use Solidity if you prefer using the warp compiler.
See https://twitter.com/0xgreg_/status/1440340076030881792?s=21.

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Warp repo can be found here - GitHub - NethermindEth/warp: Bringing Ethereum Virtual Machine to StarkNet at warp speed!

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