The practice exchange project is adopted from the truffle tutorial BUILDING ROBUST SMART CONTRACTS WITH OPENZEPPELIN. This tutorial teaches you how to make an ERC20 token using openzeppelin within your smart contract. They also show you how to upload your contract to a test ethereum blockchain.

One of the edits I made within the truffle tutorial was I created another ERC20 token called Ljtron token with a symbol of LJ. I created a smart contract and imported the openzeppelin ERC20.sol file.

Another edit I made was I gave the user the ability to choose another token other than the TT token. I gave the user the ability to use the token I made and when they click the ljtronContract the user will see his/her balance of LJs.