The members of the Outreach Workgroup heavily use Telegram for coordination and matrix/freenode in minor part. If you want to help, you can contact the workgroup on one of these channels. It is quite structured, so you'll probably be directed to a coordinator.
As the name suggests, the Monero Research Lab is the workgroup focused on Monero-related research. It's formed by scientists finding ways to improve Monero's protocol and features. Most of the protocol improvements that make Monero amazing, like CLSAG and @Bulletproofs, are the result of the efforts of this workgroup.
Monero Space is an active, project-focused Monero workgroup that provides services to the Monero community. It hosts popular resources and organizes events such as Monero Meet.
Monero Policy Working Group is a loosely formed quorum of individuals with an interest in interacting with regulators, policy makers, and the wider financial services sector to ensure broad understanding of Monero’s component technologies, especially with regards to its compatibility with evolving regulatory and compliance requirements.
You are strongly advised to verify the hashes of the archive you downloaded. This will confirm that the files you downloaded perfectly match the files uploaded by the Monero development workgroup. Please don't underestimate this step, a corrupted archive could result in lost funds.
Monero is not only committed to making a fungible currency, but also to continued research into the realm of financial privacy as it involves cryptocurrencies. Below you'll find the work of our very own Monero Research Lab, with more papers to come.