Is it important to know how Javascript work under the hood?

After using javascript for all kind of projects and doing it professionally for almost a year (Developing React Native apps) I asked myself how does javascript work and does it really matter ? When i asked my friend that is much more experienced than me, he told me : Look Toni, it works. I don't care what it does under the hood.

Then one day i stumbled upon medium article named "Master the JavaScript Interview" or something like that, with bunch of questions I've heard about but i could't really answer them. There were bunch of questions like which paradigm javascript uses, difference between class and prototypal inheritance, pure functions, composition, call stack , callback queue...

Wait, maybe it does matter.

“Yes, there are two paths you can go by, but in the long run, there's still time to change the road you're on.” - Led Zeppelin

This is when I've started to dig deeper.

This article of course can't explain all of it but something that stuck with me on my journey of understanding javascript and something that i think can help a lot of you understand javascript better is this youtube video:

It is focused on explaining what the heck "event loop" is but it explains so much more. I can't recommend this talk enough that i had to write a dev.to post about it.

Finally, after researching a lot i think i've changed the way i think. If you want code great websites, apps or anything else you have to understand the background , you have to understand how it works under the hood. It can save you so much time no matter which framework you are using Angular, Vue or React they are all based on javascript.

I would like to hear your opinion.

Thanks for reading :)