Is Anapanasati considered Samatha? I'm new to Buddhism, and I have some trouble understanding some core aspects on meditation. Is Anapanasati considered Samatha or Vipassana?
It depends on how it is practiced. According to the tradition of the commentaries(I think it comes from the commentary on the Kattavathu, the fith book of Abhidhamma but I'm not totally sure), the distinction between samatha and vipassana meditation lies in what the object of meditation is. In this model, meditation on an object of ultimate reality (that is to say, meditating on that which is experienced directly such as sensations, feelings, etc...) is considered vipassana, and meditating on an abscract concept that is more than just direct experience is samatha.