Do we need to use the html/body/head tags? is it necessary?

Question

But I did not deal with them in other training.
I think that they are used for the beauty and orderliness of the codes and are not necessary.

Answer 1

I find answer.
We can not say that we do not need them, although browsers will automatically consider them.

Answer 2

But I write code in html file without using them and it is displayed in my browser!!!

Answer 3

Yes, as @Bhavyana Bhav points out, they are part of the syntax of a proper html document. If this has not been part of your training, you should seek for alternatives.