Sometimes when I'm reading philosophy some greek terms become a problem (I'm looking at you, Heidegger), and I have to keep checking the Internet for translations and explanations. I've already searched for resources to learn Greek, but they are mostly focused on either learning the language as a whole, or learning traveling phrases. Also, they are usually about modern Greek, and I don't know how useful it would be regarding the (Ancient?) Greek used in Philosophy.
I was trying to find something that, for example, focus on roots and how they combine so one can get a general understanding of terms that come up in philosophical texts.
So, is there a good resource to learn basic Greek for Philosophy purposes?