Pirkei Avos, Chapter 3.
Tikun Moshe
?’?????? ??? ???? ????? ??? ?? ?? ???? ????? ????? ????????? ??????? ?????
R. Elazar said: ‘Kinim’ and ‘Pishchei Niddah’ are essentials of Torah; canons of astronomy and Gematria are after-courses of wisdom. (Mishna V)
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????? ??? is also under this category.
Although by learning these things, you can come to ????? they are the essentials of Torah, to learn them and to guard them.
However ????? ????????? you only learn them after your mind is filled with Shas and Poskim–which is like after-courses (desserts) in which you only eat after your ???? is filled with food.
(Tikkun Moshe)