I'd say you should know the very basics of HTML, CSS & some JavaScript. Then you can go and learn PHP.

HTML, CSS, JS consider them as language for front end coding. PHP will be the back-end of your system.

If you planning eventually to build web application. After learning PHP. Learn how to use Web Framework, Like Symfony. that will make stuff lot easier and more efficient.

Note: you don't need to be expert to start learning about Web Framework, they are very user friendly and well-documented.

Hi!

I've bumped into a useful piece of information on your question.

https://css-tricks.com/app-from-scratch-1-design/

Moreover, try to google it. There is plenty of guidelines and tutorials on HTML and CSS

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HTML (HyperText Markup Language) and CSS (Cascading Style Sheets) are the building blocks of the web. If you've ever looked at a website, you've seen HTML and CSS in action!

So, first we need to have some basic knowledge on HTML and CSS. Then we will go to advanced design or development of websites by using PHP and JavaScript.

More concentrate on cresting simple templates using HTML and CSS then move to advanced like how to integrate and how to do changes automatically in all pages and more then it will easy for you.

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Expecting you are looking at structure your front-end developer abilities, rather than figuring out how to utilize something like Node.js, the purpose of using JavaScript is to give practices in the program and to control the DOM. In this way, you'd need quite recently enough HTML on the page to provide you with something to have conduct follow up on. In any case, on the off chance that you want to do loads of control of the DOM you'd need alongside no HTML on the page. You don't generally need to realize any CSS to have the option to utilize JavaScript, however, there are times that what you will control in the DOM will be CSS property/characteristic data.

Having said the majority of the abovementioned, I'd like to refocus things a bit. HTML and CSS are not by any stretch of the imagination such challenging to learn, and you don't have to ponder the whole instructional pamphlet to comprehend the general thought of how to utilize them. Get your head around them by and large and begin working on structure website pages with them. You can and ought to learn JavaScript simultaneously. This isn't something that must be done successively. It works very well to get familiar with every one of the three simultaneously.

HTML and CSS is a basic thing in web design , they are not so hard that you thing . If you practice you will be expert on it,
Every thing is up to you, your life your decision .
As a front end web designer i will suggest you to learn them. you don't need to expert on this if you want to career your self in Back end developer . But if you want to career your life as a front end web designer , you should expert on it.

But if you are expert on HTML and CSS it will help you both front end and back and.
There are many internet resource to learn them.
But i prefer to go 1. https://www.w3schools.com/
This is a very good site to learn web design.
(This below suggestion for if you want to expert on HTML and CSS)
Than you should learn psd to html, a psd file will given to you and you will convert them to in HTML code.

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If you have basic knowledge about HTML and CSS you can start with PHP side by side. Start working on the simple projects with which you could learn quickly. It will be more beneficial if you could also learn Java with HTML and CSS.

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In our view, HTML and CSS codes are what any beginners should start ... There is too much information available online, it can get confusing ...

HTML is the standard markup language for creating Web pages. HTML stands for Hyper Text Markup Language. HTML describes the structure of a Web page. HTML consists of a series of elements. HTML elements tell the browser how to display the content.
Cascading Style Sheets (CSS) is a style sheet language used for describing the presentation of a document written in a markup language like HTML.