Plain text mode is designed to allow rapid entry of paragraphs of simple text. If text is cut and pasted from a wordprocessor document, the only change that is usually necessary is to specify where new paragraphs start.
Carrelet starts a new paragraph wherever it finds a blank line. Multiple spaces, tabs and single returns are converted into a single space. This means that you can start a new line whenever you want if this facilitates text entry, without changing the final appearance of the text.
Website addresses will be made 'clickable' automatically, providing they start with http:// or https://. email addresses are also make clickable.
If you need more advanced formatting, such as centred text, lists or tables, formatted text (Haz clic aquí) is a better option.