For the first two questions, you can read Hyper Oracle’s white paper, which describes zkGraph in more detail; you can also check out our ethresearch post on the definition of zkOracle.
For the third question,
Our idea is that the original DApp actually needs a smart contract + middleware (complex off-chain computation such as oracle/indexing/automation/machine learning…) + front-end page architecture. In World Supercomputer, developers can build the application in a more “one-stop way”, and the above three components can be implemented in consensus network + computation network + storage network. And those three are connected by zk data bus in a trust-minimized way.