SQL: how to organize the dependency of elements that are in the same table?

Question

MySQL

Good day, Toaster. There is a certain table with disciplines, to study these disciplines you need to study other disciplines from the same table. How to organize a table of dependencies with these disciplines?
simple table:
id, name

Answer 1

make a dependency table.
who, from whom

Answer 2

id, parent_id, name
in parent_id write the id of the discipline you want to study.

Answer 3

An additional dependency table is not the most elegant solution. It will be much more beautiful to create a hierarchy.
Remember how all the SQL textbooks give as an example a table of employees indicating which of them is whose manager?
And here is another link to the topic: Hierarchical (recursive) queries , they tell you how to deal with such tables