quick help for the knowledge catchup ([Must] web3.js/Ropsten) 100$

- I want to make a API for smartcontract
Does somebody help me to make a simple web3.js client (please help make
key of Ropsten and access from web3.js)

```
for example im stuck

curl --user YYYY https://ropsten.infura.io/v3/ZZXZ
Enter host password for user 'XXXXXXXXXXXXXXXX':
404 page not found
````

I am currently catching up these key words

- solidity (half-ly understand)
- abi (half-ly understand)
- maybe truffle??
But i want to catch up quickly . please help me via zoom sharing monitor.