Personally I like someone to show me how things work. Even now with new features in new releases, I like to watch the videos of how it works and what it can do, then I run with it from there.
So check out the many videos out there. The Archicad YouTube channel is a pretty good (and official) source - there is a link at the top of this forum.
And read manuals too, although sometimes they don't explain things so well.
If you know someone else who uses Archicad, maybe you can bother them for a few tips.
Otherwise if you don't mind paying you can get some good one-on-one training.
Also check to see if there are any Archicad user groups active in your local area -you might get lucky there.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11