There is a wide range of information out there on the Internet regarding Tesla products, beyond the Tesla website, forums, and Engage platform. TeslaFi’s firmware tracker has already been mentioned. It also links to the NotATeslaApp website which is a great place to look at release notes and upcoming features.
There are several Reddit channels specific to Tesla, including /r/teslamotors.
There are even other FAQs out there managed by other groups, including http://www.teslamodel3wiki.com.
There are dozens of YouTubers that provide good information on Tesla or other EV vehicles. Examples in no particular order or recommendation are Bjorn Nyland, Car Confections, DaxM, Dirty Tesla, Don’t Waste Your Time (local member), DǼrik, Frugal Tesla Guy, i1Tesla, model3man, Mother Frunker, Tesla Joy, Tesla Raj, Alex Venz, Andy Slye, Because Tesla, Jeremy Judkins, Pure Tesla, Tesla DIY, and Tesla Owners Online.