Meta Charset
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What is it?
Meta charset is information that is used by browsers to show the characters on the website.
I do not know much about this.
When you use an Emmet shortcut by typing an exclamation mark, you will get <meta charset="UTF-8">.
The UTF-8 is used because it supports most of the languages on the earth and even emojis.
Do you need to include it?
Yes, you can include it and make sure it is the first child element of the <head>.
If you do not include it, the browsers will automatically determine the character encoding.
Resources
Learn more about the process of the browsers deciding the character encoding of a website — HTML Standard #determining-the-character-encoding
Character encodings for beginners
Declaring character encodings in HTML
<meta>: The metadata element - HTML: HyperText Markup Language | MDN #attr-charset