What is a html script tag

Answer 1

Script tag is used to insert javascript code to the html document.

Answer 2

This kind of duplicate low quality questions are becoming rampant. If you search sololearn you would see a lot of answers. Also if you search google many blogs also address this.

Answer 3

What brought you to start learning Php? I mean: what's your purpose by studying it?

Php is primarly designed and dedicated to generate Html code... so without begining by learn at least basics of Html (and inseparable Css), you will often stuck in your Php course ^^ (all the more than Html is a descriptive language, conversely to Php wich is a scripting/programming language, and so is easiest to learn -- as for basics of Css).

However I could advise you to NOT looks at JS (for the moment) if your primary goal was to study Php: both languages are too much similar at same time than too much different and would confuse you between both ;)