generate a list of pairs
notes -when creating a component or services use -d to see all the changes that will happen -when creating a component or service use -m to add to a specific module and add --export if you are using it out side of this module
-- if i want mulitple headers, and to switch them out based on some need. i can add the .header class and that will apply all the things that header should have and just add the change you need for that header.
ng-content is for generatic layouts. you provide