Chapter 9, Truffle Basics and Unit Testing 

1. Init is used for initializing a truffle project, Migrate is used to build and deploy contracts on the target network, test is used to execute unit tests within a truffle project, and console is used to interactively work with the network using truffle. 
2. By modifying the truffle.json file and adding network details in the json format: 

   networks: {
         development: {
             host: "127.0.0.1",
             port: 8545,
             network_id: "*" // Match any network id
         }
      }