The JavaScript language has a long history. There are a lot of developers out there who are still learning the basics. But, if you're trying to learn the language and make your first steps into it, you need to know what mistakes new developers make.
You have already researched JavaScript development tutorials, and you know that it's one of the most popular languages in the world. You've started to use it for your website or app, but there's still something that feels wrong with it, isn't it??