To allow special characters like quotes, always wrap the whole block with quotes and then escape the quotes inside it with \.
fields:
my_field:
title: "A field title with \"Quotes\""
type: text
You can create global field definitions in subfolders. It's especially good if you have many global field definitions and it's starting to be messy.
fields:
myfield: subfolder/definition
Especially for plugins it can sometimes be useful to be able to get all the blueprints. Let's see how that is done.
$blueprints = kirby()->get('blueprint');
print_r($blueprints);