What is accepted on L2 Starknet?

Could you elaborate on what types of assets or transactions are typically accepted on the L2 Starknet network? Is it solely focused on a specific type of cryptocurrency, or does it support a wide range of digital assets and smart contract functionalities? Additionally, are there any specific restrictions or limitations on what can be transacted on Starknet's L2 solution, and how does it compare to other Layer 2 scaling solutions in terms of compatibility and versatility?