This question caught my eye in the review queue:
OP is asking how to take code, which is already written, and add it to a page in Magento 2. 4 close votes queue up saying that the topic of the code, An Instafeed script block, is off topic for this site.
I realize that the inner workings of Instafeed would not be supported - but this is someone who has a working block of code who just wants to add it the correct way to a site in Magento 2.
We don't need to rehash again, for the 20th time, what is on-topic and what is off-topic for MagentoSE, but this seems clearly on-topic to me as the entire point of Magento is to add customizations to it. If this instead said MyCustomClass instead of Instafeed this likely wouldn't have been marked as closed.
Let's be vigilant to try to be helpful and welcoming to newcomers to both this SE site and to Magento 2 by suggesting best practice and pointing newbies to worthwhile resources. One way we can do this is to make a concerted effort during MageStackDay #5 on June 17 and 18 2016 to answer questions, even the difficult ones, rather than resort to closing out old ones.
Register today at http://magestackday.com/
(And an answer would be welcome on that question)