Is it permissible to place an advertisement on my website for a store that sells both halal and haram goods, and is it possible to advertise only the halal goods, and what is the practical solution for cooperating with this store if advertisements are forbidden?

There is no harm in cooperating with or promoting the aforementioned store if the majority of its activity involves selling permissible items, provided that honesty and trustworthiness are observed and that the advertisement does not include promoting anything forbidden or objectionable.