W3Schools is one of the most used online resource site for coding. But with my personal experience, it lacks a few things:
They don’t go in detail much. They only taught basic to me. I had to figure out the rest.
It isn’t easy to use. I had to look for some time before I found out a particular resource.
I had some trouble. But the overall service is good and can help beginners immensely. It is not the best resource for advanced users like me.