ᐅ Garden shed with an extension – which foundation is suitable?

Hello everyone,

I plan to set up a garden shed in autumn. It is a log cabin-style shed (3 m) with a 3 m extension, so 6 by 3 m (approximately 20 by 10 feet).

Now I am wondering how to most easily design the foundation. From my point of view, a concrete slab seems a bit excessive.
I could build a wooden substructure with anchors set into isolated footings, or work with ground anchors.
Maybe I am completely off track, so I would really appreciate your opinions on this.
Regarding ground anchors or isolated footings, how many would I need?

Thank you and best regards

Zenjamino