Ethereum

Lets do it
Implementing source code

so after the theoretical part let get started how we can write a blockchain app using ethereum. 

there are few tools that we  to build and test ethereum app

1st one is vs code we can other IDE as well but I prefer this becuase it has etherum extesnion that can help in writing smart contract and resolving syntax error.

we need nodejs

then we need MataMask, mataMask help connecting to our development framework truffle or etheruem. and make blockchain tractions. It inject web3.js into webpage the help us in reading and writing blockchain transaction.

there is not infomation is provided in reference why we need meta mask

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then lets get started