Zahavasdad, you mean Ir Hanidachas.
Miswesterner, more appropriate would be Lehagdil Torah Ulehaadira. That is what Chazal answer to this question.
Learning Torah is a Mitzva, no matter which topic. Therefore it is very applicable for you to learn it. How about another question, why do we learn Gemara at all? Why can’t we just go through the Kitzur?
The Maharal explains that the Torah is the logic of Hashem. When you adapt your thinking to that of Hashem, you are making yourself more similar to Him.
When you learn about a certain Mitzva it is as if you performed it. If you know that you can never do a specific Mitzva, then surely you should learn its Halachos.