最近上网课，用HTML做了个课程表。但是结果与我预想的不一样：字体样式有问题！全是粗体，标题和段落都一样了！怎么回事？
<!DOCTYPE HTML>
<html>
<head>
<meta charest="utf-8">
<title>lessonlist</title>
</head>
<body>
<h1>lesson
<table border="3">
<caption>lessonlist</caption>
<tr>
<th>time</th>
<th>Mon.</th>
<th>Tue.</th>
<th>Wed.</th>
<th>Thur.</th>
<th>Fri.</th>
</tr>
<tr>
<th>lesson1</th>
<td>Ma.</td>
<td>Ch.</td>
<td>Ch.</td>
<td>Ma.</td>
<td>En.</td>
</tr>
<tr>
<th>lesson2</th>
<td>Ch.</td>
<td>En.</td>
<td>Ma.</td>
<td>En.</td>
<td>Ma.</td>
</tr>
<tr>
<th>lesson3</th>
<td>En.</td>
<td>Ma.</td>
<td>En.</td>
<td>Ch.</td>
<td>Ch.</td>
</tr>
</table>
<p><b>lesson4</b> 2：00发内容，下线自主学习。上传QQ相册。</p>
<p><u><b>Warning!</b> 周一8:20~8:55升旗仪式。</u></p>
</body>
</html>
<!--课表-->
求大佬相助！！！
