Blockchain for beginners:build certificate registration DApp

What we cover We briefly cover the philosophy of the blockchain and Ethereum. Then we will explain how blockchains work, what is Decentralized App and how smart contract communicates with DApp We setup the easy development environment, including tools that can be used with minimum steps And the biggest part of the course is dedicated to guiding you through a simple Decentralized App Some of the keyword definition: Blockchain is a growing list of digital pieces of information which are linked using cryptography. It is an open, distributed ledger that can record transactions between two parties efficiently and also in a verifiable and permanent way. Decentralized applications (d Apps) are applications that run on blockchain rather than a database. Smart contract is defined as pieces of computer code that self-execute when predetermined conditions are fulfilled. The results of the transaction will be written onto a distributed ledger or blockchain. We covered the following concept: Ethereum Account Gas Smart Contract Decentralized App Blockchain Bitcoin Solidity Web3. js Ropsten Testnet What tools and libraries are used?Ethereum The Metamask Chrome extension The Solidity smart contract language (0.5.0)The Web3. js(Web3 1.0.0)The Ganache Ethereum node emulator Github Visual Studio Code (text editor)The Ropsten test network All our codes are stored in Github and the solidity code will be stored as. sol file. Lesson 2 unit 1: @hashcademy-> choose certificate dapp -> choose branch master Lesson 2 unit 2: @hashcademy-> choose certificate dapp -> before modify javascript:  choose branch 1a, after modify javascript: choose branch 2Lesson 2 unit 3: @hashcademy-> choose certificate dapp -> choose branch 3Lesson 2 unit 4: @hashcademy-> choose certificate dapp -> choose branch 4Lesson 2 unit 5: @hashcademy-> choose certificate dapp -> choose branch 5