This is a pre-release version.
When you study a new language the big problem is remember and review new words or rules. WordBank helps you to save and remember that you learn and you can create your own dictionaries. For each word you can take a picture to remember better the word you learnt. An important section is collocation: for rules and words you add some collocation sentences to practice and remember better.

Writing a rule is simple: use Markdown style for a nice description.