Root folder structure different depending on where you download
I'm brand new to Magento and I have gone straight to M2. I had some initial issues getting M2 up and running and worked through a number of different solutions. What I have noticed is that depending on where/how you download M2 the root folder structure is different. e.g. If you pull from GitHub the app folder is: root/app/code, design, etc, i18n (which is what I expect according to the training videos). However if you download M2 with Sample Data (yoga shop) the structure is: root/app/design, etc The code folder is in root/update/app/code
I have also tried downloading some other themes and the code folder seems to also be in the 'update' folder.
Can someone please help to clear this up as I have created a module and it works fine the GitHub version but I don't know where to put it in the others.