Welcome to the Bunnings Workshop community @emdai50. It's amazing to have you join us and many thanks for your question.
Was there a particular product you were interested in that I could provide information on?
The sheds come with pre-drilled holes in the panels, and you'll use the included screws to join them. They also get Dynabolted down to your concrete slab via the supplied L brackets. You should find this guide on shed assembly by Pinnacle hardware useful.