You can host your own personal webpage at Blinkenshell. To do this, put any files you want to be accessible via HTTP in the directory public_html in your home directory. The URL to your webpage will be https://username.u.blinkenshell.org/ (old accounts have no HTTPS and are available at http://username.blinkenshell.org instead, ask independence if you want to migrate to the new hostname and HTTPS)
If you have a file named index.html in your public_html directory that file will be used as the index page when someone browses to your site without requesting a specific file (i.e. https://username.u.blinkenshell.org/). If you do not have an index file a directory listing of all the files in your public_html will be shown instead.
You can use Apache .htaccess-files to customize the behaviour of your webpage. Apache documentation on htaccess.
Logs from apache are written to ~/logs/access.log (normal traffic) and ~/logs/error.log (errors). These files should not be removed.
You can use PHP and CGI scripts to create dynamic webpages. CGI and PHP scripts are executed with mod_fcgi and suexec, which will make all scripts execute with your user id instead of the Apache user.
For information on how to use MySQL, see: Info/MySQL.