Already a bit fed up so I do not post these findings in an ATOMIC fashion.
1) No clear feed back mechanism or moderator person for submitting findings with setting up the SDK.
2) Was not able to search the bugs to determine if my findings are new or not.
3) Nice that there is a SDK for Linux. SDKManager would not launch (Ubuntu 24.04.3 LTS) though. There are old posts about not able to find (the old lib) webkit2gtk-4.0 which is no longer shipped with latest Ubuntu distr.
Post
https://www.reddit.com/r/Ubuntu/comments/1dd1qxz/libwebkit2gtk4037_is_not_available_on_ubuntu_2404/
entry by Ish_too about adding Jammy to the Ubunto sources helped me. Pls attach this information to the SDK for Linux info on your site.
4) On https://developer.garmin.com/connect-iq/connect-iq-basics/ the three links at the bottom (Getting Started) give you a 404.
I will leave it at that. Perhaps more if I see this info has been fed-back to the site.