On the one hand Ontology deals with question what does it mean for a being? Related to this question are several other subquestions. For example when are two things identical, i.e. when can two Things be considered to be the same? Is everything that exists also real or does something exists tat is only possible? Are there really things that do not exists?
On the other hand Ontology tries to Categories the whole World of being into Categories. So what categories of objects do exist? related to this were several questions for instance do Things exists that are only unique or only multiple in its existence? Do things exists that are unilaterally dependent on others and which sort is this dependency of there is any? Do so called necessary Properties exists? And how do composed Things relate to their Components. This it is to somehow explain the world and Categories the world and bring structure into the World when one answers these kind of Questions independent from what one precipices with one's senses, i.e. independent of Epistemology and only explained from our mindset.