How can I create a private tree?
For example, I would like to teach technical German from my subject to my students, and I understand those trees would not interest most of the people in the community of Duolingo, because it isn't daily-life vocabulary.
Thanks a lot for helping!
You cannot create a private tree on Duolingo.
You might find Memrise or ANKI appropriate for your needs, however.
Sorry, I do not understand what you mean with ''Memrise or ANKI''. Please, could you explain me, or tell me where to find the information?
Memrise is an online learning tool with courses created by its community. Its courses are mainly used to teach language, but are also used for other academic and nonacademic subjects, including science, music, history, philosophy, and popular culture. Memrise uses flashcards augmented with mnemonics (known within the service as "mems")—partly gathered through crowdsourcing—and the spacing effect to boost the speed and ease of learning.
Anki is a spaced repetition flashcard program. Anki (暗記) is the Japanese word for memorization. The SM2 algorithm, created for SuperMemo in the late 1980s, forms the basis of the spaced repetition methods employed in the program. Anki's implementation of the algorithm has been modified to allow priorities on cards and to show cards in order of their urgency. The cards are presented using HTML and may include text, images, sounds, videos, and LaTeX equations. The decks of cards, along with the user's statistics, are stored in the open SQLite format.