A Collection of Data and Links to get you started! (I stole this from reddit)
Core Rules Read Thru (by u/GlassHalfDeadTV):
https://www.youtube.com/watch?v=7JKT2i3VFyo
Core Rules Sneak Peek (Thanks /u/subaqueousReach): https://drive.google.com/drive/u/0/folders/1Uu3nGpBCOGtCLL7Vh_jIac99Yy4s9rEF
Rules Overview (CanYouRollACrit):
https://canyourollacrit.com/2021/08/09/kill-team-octarius/
Free Online “Course” for Learning the Rules (by u/emilbrett ):
https://rise.articulate.com/share/YnYJx_m1yFjcjdtI7befC35yuEABqa-T#/
How to Play Kill Team (Part 1) (from Strategic Advantage): https://www.youtube.com/watch?v=Ju1kuzrtje0
Line-of-Sight, Cover, and Order Rules Explained (by u/GlassHalfDeadTV):
https://www.youtube.com/watch?v=t4wmh_rxBwA
Easy To Miss Rules List & Discussion
https://www.reddit.com/r/killteam/comments/pkbzib/easy_to_miss_rules/
Compendium Sneak Peek (Thanks /u/subaqueousReach):
https://drive.google.com/drive/u/0/folders/1EbzBrGbMiW9KGZPgCzmmyrTKXJDg4BSo
THE KT 21 Reference Sheet PDF (by u/ChronoDK):
https://drive.google.com/file/d/1kgToAvu_TXRmAQIA1kkdLKih4rCJOE6u/view
KT21 Single Sheet Reference/Rules (by u/Armagonix):
https://www.dropbox.com/s/mrtt6z924u1h3lt/kt2_rules.pdf?dl=0
FAQs about the rules explained by a normal person (by u/JeremiahBlitz):
https://www.offmetamusings.com/2021/09/killteam-2021-frequently-asked-questions.html
One-Box Kill Teams for Beginners ( u/GlassHalfDeadTV): https://www.youtube.com/watch?v=waXbxVdwRow
Top 5 Kill Teams for Beginners ( u/GlassHalfDeadTV): https://www.youtube.com/watch?v=zJ_oNPAFCMs
Kill Team Models, Weapons, and Damage spreadsheet (by u/OriginalUsernameX):
https://docs.google.com/spreadsheets/d/1Sa76-kNCVpLe0sLMEryo7l7QdZZOBqOrkhnENj55Mtc/edit#gid=0
Kill Team Costs Spreadsheet (by u/rogueguineapig):
How to setup your Terrain ( by u/GlassHalfDeadTV)https://youtu.be/MacG446wL6k
Many of these links helped me get a grip on the new system. What else should go on here
I've taken the liberty of cross posting this guide to lemmy.world's 40k community to give it some more visibility.
Thanks. The little bit of info i could find was all on reddit, so i liberated this for fellow newbies here