There is a collection of "minor tractates" some of which contain material not found in other works of torah sh'baal peh (the oral law). What is the origin of these tractates? Who wrote/compiled them? What is their status in the hierarchy of torah sh'baal peh ie. do they outweigh a breita for example? Are they all considered authoritative?
Semachos is reffured to in the Gemoro Moed kotton as aveil rabosi and is quoted numerous e.g moed kattan 13b and 24a תנא באבל רבתי and brought many times in tur shulchan aruch times as being authoritive with regards to laws of mourning
Kalla is also quoted in kesubos in sugia of sheva brochos (kesubos 7b),and is enumerated amoungst authorotive masechtas a talmid chochom must know in kiddushin 49b and shabbos 114a. calla rabasi is an explanation of calla, and aggadic midrashim including chapter 6 pirkei avot.
sofrim is quoted by shulchan oruch as the source of taanis bchorim and various other dinim.
tzitzis, tefilin, geirim, sefer tora, kutim, and mezuza are all quotes from the gemoro brought together in one place.
avos de rabbi nosson ismainly aggadic teachings that are expanding on pirkei avos.
derech eretz rabba and zuto are about how one behaves at meals hosts, and other aggadic literature.