MacMost: Contacts

Using Lists in Contacts on Mac, iPhone and iPad
Lists replace Groups in the Contacts app and since you can now manage them on the iPhone and iPad they are much more useful.
Using Contact Groups On a Mac

You can create groups in the Contacts app on your Mac and use them to quickly send emails to several people without needing to select each contact. Groups can be used for organization too, and can help in other apps like Messages and Calendar in some situations.

Missing Contacts, Notes, Events Or Emails On Apple Devices
A common problem is finding that you are suddeny missing contacts, notes, calendar events or email messages on your Mac, iPhone or iPad. It could just be that you are looking only at a specific account or subgroup of those items in that app. Here's how to switch back to viewing all entries.
Importing and Exporting Contacts On a Mac
Exporting contacts from the Contacts app to a spreadsheet may seem impossible until you learn one simple trick. You can also export a spreadsheet to a CSV format and import contacts into the app.
Printing Envelopes With Your Mac
There are many ways to print envelopes with your Mac. In this video, we'll look at using Pages to print a single envelope. Then we'll compare that to using Contacts to print. You can also get third-party apps in the Mac App Store that give you even more options.
Company Contact Cards
In the Contacts app you can set a contact to be a company rather than a person. This is helpful for customer service lines or other company main numbers. You can use the company name with Siri, and also add images for the contact just like with a person.
Cleaning Up Your Contacts
It can be useful to remove unneeded contacts from your database every once in a while. Before deleting, you can export individual contacts as small VCF files. These can then be stored and accessed easily later if you need them. You also have a variety of other methods for exporting and archiving your contacts.
MacMost Now 830: Exporting Contacts Using Numbers
Export and printing options for Contacts are limited. But you can do almost anything you want with your Contacts data if you know this one trick. By dragging and dropping your Contacts into Numbers, you can then organize, sort and format the information in any way. You can then export it from Numbers, or use Numbers to print a list any way you desire.
MacMost Now 732: Printing Lists of Contacts
Using the Address Book app you can print out lists of contacts, specifying exactly which fields you want to include. You can also print compact pocket lists that can easily be carried with you.
MacMost Now 726: Printing Labels and Envelopes From Address Book
You can print both labels and envelopes from Address Book without needing to do a mail merge or use another app. You can choose from many different standard label templates or create your own. You can also choose different envelope sizes. You can print them in bulk, or just use this feature to print a single envelope.