Translation:What do they sell in that strange shop?
Peculiar není moc obvyklé slovo, proč mě duolingo nepouští na "special shop"
Is obchod female? Because of the ě suffix. Although it must be male because of tamtom, so it's rather an exceptional declension
Obchod is masculine inanimate, but both the locative singular case has two possibilities: obchodu and obhodě. (See, for example: https://en.wiktionary.org/wiki/obchod.) Perhaps one of the Czech natives on the team can tell you when/why one may be used rather than the other, or if they are completely equivalent.