How

It takes a lot of time and practice, but it's worth it and it's really fun.
I would recommend to start with basic HTML and CSS.
ReeliChat for example has a really good design that's very difficult to achieve for a beginner.
ReeliChat was also made using SCSS which is a really cool thing but it's not really beginner-level but you could try it after you learned the basics of CSS.
Most websites(including ReeliChat) are made with Bootstrap but I personally prefer not using it even though it's actually a pretty nice library.
Brickplanet and Brick Hill did not or did not directly use Bootstrap.
Brick Hill didn't use any Bootstrap and their website is generally trash.
Brickplanet didn't use a direct version of Bootstrap, it used a custom version.

My websites were complete trash when I was a noob at HTML and CSS.
I had a terrible website that was attacked by raiders 8235872378058032580 times and I eventually closed it down to start a new project.
That new project's design was skeuomorphic, but at one point, I decided to move to a flat design because my skeuomorphic design was truly awful(it was so unresponsive that it messed up even in windowed mode). I changed my design to an amateur flat design because I was unused to flat designs. Right now, I am making a more professional-looking website with tons of new features that I hope will get some users(probably won't ;( ).

wow

i use only html and css

I don't know what to do in CCS

I used uCoz but it failed i'll never make a good gaming web :(

i falied aslo in CSS

CSS is an abbreviation for "Cascade Style Sheet" and HTML is an abbreviation for "HyperText Markup Language".
CSS styles your HTML. Without CSS, your website would look terrible.
I would recommend W3Schools.
Also, I want to correct my previous post, ReeliChat doesn't use bootstrap, it uses Bulma.css, that's why it's so good.

Try this:

index.html
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" type="text/css" href="main.css">
</head>
<body>

<h1>Hello world!</h1>
<p>Test webpage!</p>

</body>
</html>

main.css
h1 {
color: red;
font-weight: bold;
}
p {
color: blue;
font-style: italic;
}

Oh My God IT'S BEUIFUL!!!!!!!!!!!!!!!!!!!!!!!!!! its emtiy lol