Untitled

.header {
  height: 95px;
  display: flex;
}

div {
  border: 1px solid red;
}

.header-link {
  margin: auto;
}

.beginner-project {
  width: 636px;
  height: 430px;
  background-position: center;
  background-size: cover;
}


<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <link rel="stylesheet" href="normalize.css">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <link rel="stylesheet" href="style.css">
  <title>Портфолио</title>
</head>
<body>
   <div class = "header">
   <a href="#" class="header-link">Яндекс Практикум</a>
  </div>
  <div class="beginner">
  <div class="beginner-project"></div>
  <div class="beginner-project"></div>
</div>

</body>
</html>