I have no coding experience at all and i want to build a social network i have in mind,is java,html and css enough?

Alex, agree with you and disagree. If we are talking in terms of web dev, you MUST know CSS, otherwise all that JS will be useless. How can you make a carousel without CSS? You can make a lot of stuff with CSS. HTML and CSS are the fundamentals for any further education. Also, I don't think he wan't to work for anyone, he can always use plugins.

Like, you can know JS, but if you don't know how to make an element position fixed, than how can you make anything with JS?

What i mean that JS is the last thing you want to focus. You want to master the basics first. HTML and CSS, those are the most important at the start. You can't possibly do PHP either, because you will not be able to build anything with HTML and CSS. Also, if you do make a social network, assume 5k lines + and you have a badd HTML and CSS, you will strugle to maintain it, in in near future you will need to re-write the code.

It's better to have someone how knows the fundamentals, than someone who rushes every technology. There's moe than knowing how CSS works, because it's hard to write good CSS code, that scales.

JS is important once you got those basic skill. You don't want to go throw front-end track doing HTML, CSS, JS because that woudl be a waste of time. I'm telling you from my own expericne. Focus on one to two thigns at the time, when you are new you shoudl focus on one thing, that must be HTML and CSS. I know a guy that know JS, 4years of software development with JS, but he can't do anything on the web, because he lacks the knowledge of CSS, so all those cool stuff, he can't do.

Also, for things like carousel and stuff, again, you can have some plugins, o use jQuery which is easy one you know it. It also depends on the project, if you need lots of JS or not. if you don't then JS shoudn't be that much of a problem anywas.

But again, I said focus on HTML and CSS, and then JS. Exlude JS at first.. because that will be waste of time since you need to practice CSS and HTML first.. and remember some commands. It's not good to go on the internet all the time researching how to float, float: left; every time , you shoudl really memorize those basics stuff. it will come with time. More likely you shoudl understand CSS, so you don't even need to memorize anything, or most stuff. I know that the mroe I practice now, the less of technique i need, because I understand how the browser thinks, so I just do it most of the time, but it's fairly new to me, with more experince id be able to do it a lot easier than now.