One of the big features for craft 3 is content migrations. Migrating fields and sections between environments (like deploying code to test or production). I'm just having a hard time figuring out what options there are. I did find some simple examples, but they are a little limited...
https://craftcms.com/news/craft-3-content-migrations https://docs.craftcms.com/v3/content-migrations.html
Since there is a separate documentation page which seems incomplete i created an issue. If anyone has some additional info i would like to make a pull-request to complete the docs.