And it is not easy really! But none of these fancy "Simplest Guide" seems care about the details. I finally started to spend some time to learn how Ethereum act

And it is not easy really! But none of these fancy "Simplest Guide" seems care about the details. I finally started to spend some time to learn how Ethereum actually works (not conceptually or principally) last weekend. While I can compile the Sol file and "deploy" the contract. I don't even know at this point what JSON-RPC call looks like if I want to invoke the contract on the testnet, nor I figured out how to transfer money between addresses with only JSON-RPC call, not coding up a new contract.