Is the entire operating system and its components updated automatically or do I need to run the update manually?
You can update the OS components manually.As for the stack - it cannot be updated.
Besides bulgaru answer, you can update the stack by migrating to a new one. Here you can find how to do it.
If you have any other question and you think we can help, please don’t hesitate to ask.
Best regards,Silvio Fernández