PLEASE SHARE YOUR OPINION: Why are most Side Projects always unfinished?

For a JavaScript beginner, Is it efficient to learn with or use "Strict Mode" while building stuff?

Aside building Projects, which is your best bet to learn a new language?

Videos or Books ( including articles, posts etc).

Which is your best bet?

Please look at this code, I wanna know why the $ and {} was added to the alert method to pop up the key and value of user.

what is their functionality there?

let user = {
name: "John",
age: 30
};

// loop over keys-and-values
for (let [key, value] of Object.entries(user)) {
alert(`${key}:${value}`); // name:John, then age:30
}

what is the difference between .split(), .split('') and .split(' ') ?

What are your best practices for debugging buggy codes?

What causes a mobile app UI to run slow or laggy? and Can a framework cause an app UI to run slow or Laggy?

I have reinstalled node js 3 times to run JS scripts and "npm run dev" is not starting up the server. This is quite frustrating.

😂😂......if you ever did this raise your hands

I want to make a career in debugging codes, what's the best way to achieve that?