Ask HN: I am going to write a Django tutorial about ...

Hello. Django community is amazing and I really want to give back, because of all the help I received both online and offline, when I was younger. I would like to write a beginners tutorial on Django, but I can't think of any app idea, that won't be too complex for beginners. I don't want to write a tutorial about blog, todo list or poll applications as those are covered. I would be really happy if anyone can give me something to write about and of course you will get credit in the tutorial :). Thanks in advance!