In case you've had trouble tracking it down (I did), the approach to caching custom blocks is different in Drupal 8 than in Drupal 7. In Drupal 8 all renderable arrays are cacheable – including, of course, those returned by custom blocks.
Quite a bit has changed for the Migrate module in Drupal 8: the primary module is part of core and some of the tools have been split into their own modules. Recently, we migrated a Wordpress site into Drupal 8 and this article will help guide you in that process. If you’re looking for information about Wordpress to Drupal 7 migrations, check out Joel Steidl’s article on that here.
Webhooks can be an efficient way to integrate with third party services. Learn how to leverage Drupal 8 to capture webhook data from third party services like Facebook, Stripe, Eventbrite and more.
Recently, I needed to add some dynamic content to a Views footer. Specifically, I needed to change a link in the Views footer based on the current path, which isn’t an option from the Views UI. I found some good documentation showing how this can be done in older versions of Drupal (https://www.drupal.org/node/749452), but nothing for Drupal 8. I figured the approach must be similar in Drupal 8 so I started searching and reverse engineering.