What is the process to learn Greek as a beginner?

[rustymason]

There's no one best way but I recommend you download a Greek primer and work through it. Here is a list of primers, answer keys, and readers here:

http://www.textkit.com/greek_grammar.php

If you don't like the first one, get another, and another. Google has even more free ancient Greek primers, texts, and interlinears.

[Sinister Petrus]

Ignoring the obvious spam…

Yes, check out the free primers. They're free.

If you don't find what you like, try finding others at Amazon (or books.google.com or similar site) and doing and inter-library loan request to get a preview of the whole book. Public libraries in the United States should do this for you for free. Local university libraries are more likely to have these sorts of books on their shelves, but checkout/stack browsing privileges may vary.

The Teach Yourself series has an Ancient Greek book that doesn't look too bad and should be both widely available and inexpensive.