Another interesting online resource is Textkit:
It's both a forum and a resource for learning Ancient/Koine Greek and Latin. There are some valuable discussions about books and other things but also in-depth grammar discussions. I haven't spent much time there myself (maybe I should?), but I think it's a good resource to be aware of.
All this online discussion is not to say your shouldn't look at good old books. I think Textkit uses some old books on Internet Archive to learn Greek and Latin like http://www.cloviscorp.com/coll…/greek/rouse/grammar.html
but there's also
The JACT Reading Greek series (see my bookshelf image above)
Teach Yourself Ancient Greek
However, some of those stick to the grammar-translation method which isn't necessarily the best way to go about it. Comprehensible Input (CI) seems to be more in favor now, but it seems to me both have their place. Both Luke Ranieri and Carla Hunt are big proponents of the CI approach and have GREAT content to back it up.
Here's more Latin CI content:
That's enough for now!
I encourage others to share their experiences and favorite (or least favorite!) learning resources.