The tutorial I'm working through: http://alanstorm.com/category/magento-2
does not explain what to do with the missing app/code directory. Neither does the book tutorial I am reading. Google search doesn't answer this question in a way that I can proceed.
Can't I just create this directory? If so where should it go?
Does composer create this directory? Do I have to use composer? If so — how?
Thanks for your reply.
I got Magento by compressed archive. I could not get the tutorial for Magento to work and I wasn't sure if the app/code directory I created was the reason. I created the directory in my computer simply by right-clicking inside the magento folder an choosing New > Folder. I created an app/code folder directory like this:
Should I do this?
I don't think you should create the folders at all. If you need to develop code for Magento, you should clone the GitHub repository.
Having app/code directories will probably just make things too confusing.