to zalman… a few mitzvos that are not applicable today or never were:
Ben Sorer Umoreh, Ihr hanidachas, Mechyas Amolek, Binyan hamishkan,Negoim in houses(according to the medrash).
I am not saying that they are “irrelevant” ,Chas vesholom. You will get schar learning those as any other mitzvoh. It just so happens that some mitzvos cannot be applied today.
If you want actual halochos, I’ll show you some too.