Answer 1

first of all, you had a mistake here:
let btn = document.qetElementById("qw"):hit() // its get not qet, and you dont need to add a colon and the function name

If you want to use the event listener your code should look like:

let btn = document.getElementById("qw")
btn.addEventListener('click', hit)

function hit() {
console.log("Home");
}

but you have to remove the onclick attribute from the html tag.

if you want to use the onclick attribute you were missing parentheses.
so it should be:

<button id="qw" onclick="hit()" type="button" class="btn">Home</button>

Then in your JS file all you need is:

function hit() {
console.log("Home");
}

Answer 2

https://code.sololearn.com/WgDgPXtwp0q4/?ref=app

I removed your html "onclick" part, added the window.onload thing to the JS and fixed the event listener.
g =/= q (be careful)