You need Jetpack - Portfolio module enabled to use this section. Projects will appear here once you activate the plugin. You can also disable this message from Customizer > Settings > Extensions > Disable helpers/placeholders.
This is a description for the Contact section. You can set it up in the Customizer where you can also add items for it.
[contact-form-7 id=”128″ title=”Formulário de contato 1″]