Q: sync all my apple products

You can connect them to same network and use file sharing

Mac Basics: File Sharing - Apple Support

You can keep documents and other things in iCloud Drive and aces them from any device:

Mac Basics: File Sharing - Apple Support

iCloud Drive FAQ - Apple Support

You can also use apps/services like DropBox and and Google Drive to keep files in sync.

However, you can only sync iOS devices like an iPhone with one computer

You can share your iTunes library on the computers by:

Learn more about Home Sharing - Apple Support