You place 2 files (index.html and style.css) in one folder (website/).
In index.html, in the <head> section, you add the <link> element and add style.css as the value of attribute href=
Like so:
<!DOCTYPE html>
<html lang="en">
<head>
<link rel="stylesheet" href="style.css">
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
</body>
</html>
Success!
PS: I wish I had more time but I'm sorry that I can't help you out on every question via the comments!
no problem, thanks a lot. I tried this but it didn't work yet. Ill try again. ;)
Good luck!