schitte, hier das kontaktformular mit korrigierten ulli:
<!DOCTYPE html>
<html lang="de">
<head>
<title>
Christopher's Seite
</title>
<meta chartset="utf-8">
<meta name="author" content="Christopher">
</head>
<body>
<header>
<h1>Christopher's Seite</h1>
<nav>
<ul>
<li><a href="main.html">Willkommen</a></li>
<li><a href="kontakt.html">Kontakt</a></li>
</ul>
</nav>
</header>
<main>
<p>Das hier ist meine Kontaktseite.</p>
<form action="zielseite.html" method="post" name="mein-form">
<fieldset>
<legend>Pflichtfelder</legend>
<label for="name">Name</label>
<input type="text" id="name" required/>
<label for="email">E-Mail</label>
<input type="email" id="email" required/>
<label for="nachricht">Nachricht</label>
<textarea id="nachricht" required></textarea>
</fieldset>
<fieldset>
<legend>Optional</legend>
<label for="anrede"></label>
<select id="anrede">
<option>Dr.</option>
<option>Prof. Dr.</option>
</select>
<label for="checkbox">Newsletterabo</label>
<input type="checkbox" id="news" />
</fieldset>
<input type="submit" value="Absenden"/>
</form>
</main>
<footer>
<nav>
<ul>
<li><a href="datenschutz.html">Datenschutz</a></li>
<li><a href="impressum.html">Impressum</a></li>
</ul>
</nav>
</footer>
</body>
</html>