Q is a military intelligence dissemination program, designed to expose truth over time to the public, in order to build a grassroots movement that will help support in the overthrow of a powerful group of criminals called the "deep state" or "cabal". A main facet of this is to wake people up to the mainstream manipulation of the public's minds and recruit them to help redpill others, so that they can transcend the manufactured divides and bring people together in truth.
Introduction by American Thinker
Another introduction by Martin Geddes
Another Introduction to Q and the Great Awakening truth movement
Here are two short video introductions by Joe M: https://youtu.be/KVeDKuHPDK8 and https://youtu.be/MRtEgdgj_XQ
Q drop aggregators: Qanon.pub and Qmap.pub
X22report and Prayingmedic for daily Q news and grounded decodes. Prayingmedic also wrote a book. The book is good for beginners and he has some beginner Q vids too.
RedPill78 is also popular for Q related news
Gab community This is NeonRevolt's community, who also wrote a book.
Qresearch boards on 8kun (Where Q actually posts). The threads Q will post in are titled "Q Research General"