The video of "Your first decentrazlided application" cover a lot of subject now possible with EOS blockchain. So the concepts are very important in this video giving you real insights. Don't be wondered by the sample code "Ethereum Solidity" at the end... That's give a good comparison with what is currently solved on EOS where we have the chance to work for with C++ compiled language and with a lot of libraries. I think Siraj in this video "very good presenter" is open minded with the blockchain system as soon they respect the decentralization at most !