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One big thing is that from now on, Wireguard is included in the official Linux kernel.

https://kernelnewbies.org/LinuxChanges this wiki page currently covers 5.5 but should be updated to 5.6 in the coming days.

The version-specific pages are available in draft form before the main one gets updated: https://kernelnewbies.org/Linux_5.6

OK, this is the 2-page feature overview:

Enjoy.

The LWN.net announcement post (https://lwn.net/Articles/816213/) has an overview and links to a few more detailed summaries.