Fundamental ontology is concerned with the a priori, transcendental conditions that make possible particular modes of Being (i.e., particular regional ontologies).
Fundamental ontology is only able of being carried out by an analysis of Dasein, since it is only humans who are able to encounter the question of what it means to be.
Fundamental ontology is to be pursued through a study of Dasein because, since Dasein operates with a preontological understanding of being in its everyday modes, an investigation into those everyday modes offers a first step towards revealing a shared but hidden underlying meaning of Being.
Fundamental ontology is to be pursued through analysis of Dasein because while other beings subsist, human beings ‘lead their lives.’
Fundamental ontology is ontology (Heidegger’s own ontology) which is obliged to interpret Dasein in terms of temporality
Fundamental ontology is not contemplative but as an engagement of human beings in the world. I is the anthropological preparation for the question of being.