The "Text Administration" functionality allows you to:

• add multiple texts
• organise these texts in folders
• search in texts of a folder
• get the list of words of a complete folder
• ignore words for a text or a folder, so that they are not shown as "unknown" and are not tested

Using this functionality, you can e.g.

• collect all the texts of your language course inside the app
• when you have been introduced a new form, you can learn this new form for all texts
• you can ignore unknown words to document that they do not need to be learned, such as foreign names
• you can ignore known words that should not be learned, such as words that accidentally have a form that also occurs somewhere in your texts

If you do not want to buy, you can achieve nearly the same with some additional effort, e.g. by using the standard Notes app to store your texts and copy them over to WordFleks if you want to work with them. Using one text in the app will always be for free.