In the last section of the Deep Dive: Configuring Blocks in the Backdrop CMS User Guide, it says that:
"Information about Field blocks and instructions on how to get Field blocks to show up in the block list are available in the Understanding layouts tutorial and specifically the Example: Adding an image Field Block section."
But unfortunately I can't find that "Understanding layouts" tutorial anywhere on backdropcms.org. Does it exist and if so: where can I find it?
Here are also a few screencasts related to layouts: