Apple has released security updates and bug fixes for all systems.
The most noticeable bug in iOS and iPadOS was that after a restart, modified browsers or mail applications were reset to the system default (here is our guide on how to set up your preferred browser). This has now been fixed with iOS 14.0.1.
For Mac users it is interesting to know that problems with the Radeon Pro 5700XT in iMacs are now a thing of the past. Furthermore, current security improvements have been implemented in macOS, not only for Catalia but also for Mojave and High Sierra.
Besides the updates for operating systems, which also include watchOS 7.0.1 and tvOS 14.0.1, there are also adjustments for Final Cut Pro X and iMovie. Export problems were fixed and the general stability was increased. So have fun downloading all the new versions!