timecodes:
0:00 intro
0:42 download web3.min.js
3:57 import web3js file in html file
5:36 what is abi and how we can get it
6:53 get the address of our smart contract
8:26 what is rpc server and how can get it
11:14 call a function on smart contract with web3js javascript language
...
https://www.youtube.com/watch?v=3S3GHCdHA5A