It might be hard to believe, but there was a time when you had to call a support phone number and hope to connect with someone to help you diagnose and fix your computer or other device should a hardware or software problem arise. If you had a hardware issue that needed repair, you might have to send your laptop to a "service center," or find a local repair person to help you--all while running the risk of accidentally voiding your warranty.
With the advent of the Apple Store, you can now wander in and purchase the newest iPhone or iMac, as well as have an expert (or 'Genius,' if you will) offer you help right then and there. That may not seem like a big deal now, but it was completely revolutionary at one time.
Now, however, every one of Apple's stores worldwide (save those in mainland China), is closed for at least two weeks as a result of the Coronavirus pandemic. That leaves Mac and iPhone users in need of repairs looking for alternatives.
There are authorized repair technicians throughout the country, though many of those are faced with the difficult decision of whether to keep their businesses open right now. Apple has made it clear that it is committed to supporting those partners and is working to make sure they're able to continue providing service when appropriate.
According to a report in CultOfMac, "an internal memo distributed among authorized repairers... reveals Apple is offering maximum payouts for qualifying repairs throughout March and April--regardless of performance metrics."
To get support, the easiest option is to head to Apple's support page. If you select that you'd like to bring your device in for repair, Apple will provide you with the location of your nearest authorized repair technician.
Apple also has its usual phone, email, and chat-based support available for customers. Honestly, I'm a fan of the chat-based option, though. And, as a longtime Apple fan, I'll let you in on a little secret: @AppleSupport on Twitter is one of the fastest and best ways to get help with all sorts of problems.