This is what I have so far, please correct me if I'm wrong:

The data parameter of a transaction is where we tell a deployed smart contract how we want to interact with it. It contains a hashed JSON containing all the input for all the functions of the contract we want to interact with. This JSON is coded using the contract's ABI, which is kind of a manual on what formats the contract can take and will return. To fit in the data parameter, the JSON we want to send must be hashed.

Assuming all this is right, I'm looking for examples of non-hashed data JSONs to get a grasp on what I'm suposed to write using the ABI.