What Does This Mean?
Business Central will allow you to automatically sync documents and records like Orders, Invoices, Contacts, Accounts, & Opportunities using Microsoft DataFlex, formerly known as the Common Data Service or (CDS)
No, that is the great part of the BC user interface. Making changes is very easy and does not require a developer for most minor changes. It will require a couple service accounts to get you started. I would write this whole blog about these capabilities but Renato did a great job explaining this in his blog already: https://www.fajdiga.info/blog/2020/02/22/enable-cds-integration-with-dynamics-365-business-central-2020-wave-1/.
The great thing about the sync is you have full control on when the data will be synced between the two pieces of Dynamics 365 and when. You can determine also which types of documents you want to sync.
Can I do the same thing with SalesForce?
Are you kidding me? SalesForce to Dynamics integrations are costly, expensive and require lots of mapping. But it is possible with API integrations and some talented tech folks, like the amazing ones on my team.