To do the work requires a lot of knowledge and skills.
This application learns knowledge necessary for work etc.

It is natural that there is something you can not do.
However, it is not desirable to leave what you can not do.

If there is something weak, you can not do enough work.
To eliminate disadvantage, it is to increase knowledge and to gain experience.

At “ナレッジレベル”, you can self-evaluate to what extent you understand each ”Title”.
If you do not understand, let's learn by “テキスト” and “復習”.
Just knowing the knowledge can not do enough work.
Let's work on your own disadvantage as “テーマ”.

Addition of "Title" is irregular.
It is learning in Japanese.