Comment by jjkaczor

There are extensions/plug-ins to the standard Java server, allowing Bedrock players, and xbox accounts to join:

https://geysermc.org/

(Plus Floodgate so they don't need a Java account)

I just setup a new family minecraft server last week and have successfully hosted java and bedrock players simultaneously (one coming in from a Nintendo switch, another from their phone and several from Java clients).

There are also plug-ins allowing older (or newer) client versions to connect to your server as well (ViaVersion, ViaBackwards).