[bambataa]

I recommend the content and especially the forums on http://how-to-learn-any-language.com/e/index.html. Different languages have different best resources.

Assimil are normally a good bet in my experience.

[agos]

went to see if that website had any suggestion for Greek. Books: "not very much, unfortunately". Schools: "again, not very many places offer a course". The forums are simply not loading.

[bigDinosaur]

The new (as in literally users that migrated after the owner of the other website stopped doing anything other than keeping the server running) forum is: https://forum.language-learners.org/

[bambataa]

Oh thanks, I didn’t realise things had migrated. It’s been years since I was on the forum but I remember it being very helpful and pretty active so I’m glad it’s still going in another form.