Any sort of text, formatted or not, can be created and saved in the Notes section. Formatted text is saved in HTML format. Html documents can be copied and pasted directly from e.g. a web page or a word processor document to Notes (N.B.: images are not saved, only URI-links to external image files). There is no limit in number of notes that can be saved.
Every single document is encrypted with a random keyword before being saved. Different notes are stored with different keywords. This makes it practically impossible for intruders to use your data.
In addition, particularly sensitive notes or documents can be marked as "private" and will disappear from the screen at the hit of a button (or automatically if the app has not been in use for a couple of minutes), neither will they appear in the list. To show them again you are required to enter the PIN or (after entering a wrong PIN once) the main password.
You can create any number of categories in addition to the default "Unfiled" category. List all text docs or only those belonging to one category.
Apart from the general find/search function covering the complete database, there is a local functionality for text search in the selected note.