basic bitcoin development – Can someone explain to me about Liquid Network

You have to run elementsd with below elements.conf:

chain=elementsregtest

rpcport = 18884
rpcuser = user1
rpcpassword = password1

Use the example mentioned in Element code tutorial:

const request = require('request');

let username = "user1";
let password = "password1";

let options = 
    url: "http://localhost:18884",
    method: "post",
    headers:
     
     "content-type": "text/plain"
    ,
    auth: 
        user: username,
        pass: password
    ,
    body: JSON.stringify( "jsonrpc": "2.0", "id": "rpctest", "method": "getwalletinfo", "params": [] )
;

request(options, (error, response, body) => 
    if (error) 
        console.error('An error occurred: ', error);
     else 
        json = JSON.parse(body);
        console.log(json.result.balance.bitcoin);
    
);

The output will show the bitcoin balance returned by getwalletinfo.

Other RPCs: https://elementsproject.org/en/doc/0.18.1.11/rpc/

https://docs.blockstream.com/liquid/developer-guide/developer-guide-index.html?highlight=rpc#basic-commands