Hello Vred, how are you? I suggest these materials for learning Greek by yourself -https://www.hau.gr/?i=learning.en.podcasts -https://www.amazon.com/Greek-Comprehensive-Language-Routledge-Grammars/dp/041559202X/ref=sr_1_18?keywords=gREEK+GRAMMAR&qid=1573851969&sr=8-18 -https://www.amazon.com/Colloquial-Greek-Book-only/dp/1138958336/ref=sr_1_1?crid=39LOSIG7D95H&keywords=colloquial+greek&qid=1573852358&sprefix=cOLLOQUIAL+%2Caps%2C351&sr=8-1 - I also suggest the book ¨Ellinika Α" https://www.amazon.com/Ellinika-Greek-Learning-Foreign-Language/dp/9601628150/ref=sr_1_1?crid=26COJ83ZT5YPS&keywords=ellinika+a&qid=1573852496&sprefix=Ellinika+%2Caps%2C336&sr=8-1 (it is written in Greek but it is not hard for foreigners to understand it. As a language learner I always choose materials written in a language that I want to learn( for example for learning Dutch I used Code 1, for Swedish I used( Nya mål,mål, På Svenska and Rivstart), for Polish (Mówić po polsku) and for Portuguese(Practice makes Perfect by Sue Tyson-Ward) etc. If you have any further queries let me know it.