1st.js

// in this lecture we learn how to select any selector id , class, or ....
//console.log(window);
//console.log(window.document);

//document.getElementById...
//document.getElementsByClassName ...
//document.querySelector.... just select only one first class or selector ..
//document.querySelectorAll.....select all the classes or selector in a document and return a HTML collection ...
//document.querySelector('input[type="password"]'),,,,
// also we've learn that how we can convert any nodelist or HTML collection in to array by using
//Array.from(collection or node which you want to converted ..)

//we can apply foreach function on html COLLECTION  

// After making it array we can simple use array predefined methods just like filter map , and reduce .......