Code Review, focus on Sematics

I want to improve and won’t to know if I understand and can make a use from Sematic HTML. It would be nice if someone can look at the code and can say how good it is.
As the title of this post said, the main focus is about sematics, but if you see something else, feel free to mention it too, every feedback is ok.
In purpose for a faster review I shortened every text into TextXX.

<!DOCTYPE html>
<html>
    <head>
        <title>About Me | home</title>
    </head>
    <body>
        <header>
            <nav>
                <ul>
                    <li><a href="#mychildhood">My Childhood</a></li>
                    <li><a href="#myteenage">My Teenage</a></li>
                    <li><a href="myyoungadult">My young Adult</a></li>
                </ul>
            </nav>
        </header>
        <main>
            <h1>Name Life</h1>
            <section id="mychildhood">
                <h2> My Childhood</h2>
                <article>
                    <h3>My Birth</h3>
                    <p>
                        Text1 <br>
                        
Text 2<br>
                       Text3
                    </p>
                </article>
                    <figure>
                        <img src="https://cdn.cdnparenting.com/articles/2018/02/27175300/1103088095-H-1024x700.webp" alt="Baby who vomiting">
                        <figcaption>Text4</figcaption>
                    </figure>
                <article>
                    <h3>Kindergarden</h3>
                    <p>
                        Text5
                    </p>
                    <ul>
                        <li><h4>Imp</h4>
                            <p>
                                Text6
                                <br>Text6
                            </p>
                        </li>
                        <li><h4>Santa</h4>
                        <p>
                            Text7
                            
                        </p>
                    </li>
                    </ul>
                </article>
            </section>
            <section id="myteenage">
                <h2>My Teenage</h2>
                <h3>School</h3>
                <article>
                    <p>
                        Text8<br>
                        Text9
                    </p>
                    <h4>School Table</h4>
                    <table border="1">
                        <thead>
                            <tr>
                                <th>
                                    >Class <br>
                                    V What?
                                </th>
                                <th>
                                    1. Class
                                </th>
                                <th>
                                    2. Class
                                </th>
                                <th>
                                    3. Class
                                </th>
                                <th>
                                    4. Class
                                </th>
                                <th>
                                    5. Class
                                </th>
                                <th>
                                    5. Class <br>
                                    Again
                                </th>
                                <th>
                                    6. Class
                                </th>
                                <th>
                                    7. Class <br>
                                    1. Sek
                                </th>
                                <th>
                                    8. Class <br>
                                    2. sek
                                </th>
                                <th>
                                    9. Class <br>
                                    3.sek
                                </th>
                            </tr>
                        </thead>
                        <tbody>
                            <tr>
                                <td>
                                    Was I good?
                                </td>
                                <td>
                                    Yes
                                </td>
                                <td>
                                    Yes
                                </td>
                                <td>
                                    Yes
                                </td>
                                <td>
                                    Yes
                                </td>
                                <td>
                                    Yes
                                </td>
                                <td>
                                    Medium
                                </td>
                                <td>
                                    Medium, but <br>
                                    not in france
                                </td>
                                <td>
                                    Medium, but <br>
                                    not in france                                
                                </td>
                                <td>
                                    Medium, but <br>
                                    not in france                                
                                </td>
                                <td>
                                    Medium, but <br>
                                    not in france                                
                                </td>
                            </tr>
                            <tr>
                                <td>
                                    Do I was active in <br>
                                    the Sports lesson?
                                </td>
                                <td>
                                    Yes
                                </td>
                                <td>
                                    Yes
                                </td>
                                <td>
                                    Yes
                                </td>
                                <td>
                                    Not, realy
                                </td>
                                <td>
                                    Not, realy
                                </td>
                                <td>
                                    No
                                </td>
                                <td>
                                    No
                                </td>
                                <td>
                                    Yes
                                </td>
                                <td>
                                    Yes
                                </td>
                                <td>
                                    Yes
                                </td>
                            </tr>
                            <tr>
                                <td>
                                    XXX?
                                </td>
                                <td>
                                    No
                                </td>
                                <td>
                                    No
                                </td>
                                <td>
                                    No
                                </td>
                                <td>
                                    No
                                </td>
                                <td>
                                    No
                                </td>
                                <td>
                                    Yes, active
                                </td>
                                <td>
                                    Yes, active
                                </td>
                                <td>
                                    Yes, passiv
                                </td>
                                <td>
                                    Yes, passiv
                                </td>
                                <td>
                                    Yes, passiv
                                </td>
                            </tr>
                        </tbody>
                    </table>
                </article>
            </section>
            <section>
                <article>
                    <h3>1.-5. Class</h3>
                    <p>
                        Text10<br>
                        Text11 <br>
                        Text12
                    </p>
                </article>
                <article>
                    <h3>5.-6. Class</h3>
                    <p>
                        Text13
                    </p>
                </article>
            </section>
        </main>
    </body>
</html>