After having installed our Joomla!, we can access it from Plesk (as indicated in the installation guide) or from sudominio.com/administrator with the username and password we have indicated. Normally, after the installation, Joomla! is in English, but the Spanish language is installed. To make the change, we enter the administration and go to Extensions > Language(s) > Installed

Upon accessing, we see that we have two languages: English and Spanish. We select Spanish and click on Default, in this way we set Spanish as the default language.

When we do this, it does not change the language in the administration, so now we access our profile and then click on Edit Account. We go to the Basic Settings tab and we have two options: Backend Language and Frontend Language. Here we select the Spanish language and click on Save, in this way we change our profile to Spanish.

Joomla! manages entries as Articles. To access the Articles, we can go to Content > Articles. Inside, it will show us all the articles we have and we can edit them, add new ones, delete them, ...

Joomla! allows us to have images, text documents, ... uploaded to its Multimedia Folders. To see the files we have in Joomla!, we have to go to Content > Multimedia. Inside, we can see all the uploaded content.
We can even create folders and move them around to have them more organized, rename them, ...

Joomla! allows us to categorize the articles published on our website.

That is why we are going to break down the most interesting aspects of this section:

Joomla! allows us to manage the users of our website, in this way, we can add, edit and delete any of the users.

In this new tab, we can list all the users who are registered on our website.