Lorem markdownum freta ducentem ut flagrat undas fratrem celeres colloque; in aevo praeponere Ixiona novissima eo ater. Exhortor tuae. Est sim auras, paciscor iaculum roganti tellure, nubibus et Aetna tantis et caudice.
You can edit this by modifying the modules/sidebar/default.md page.
modules/sidebar/default.md
To reorder things in the sidebar you need to modify the partials/sidebar.html.twig template file.
partials/sidebar.html.twig
Dark Quark