've bought with the minecraft Windows 10 Edition and comes to me when I add Gomme or other server and join would like to stand there "no connection to the world" does anyone know why?
For the servers you need the Java edition of minecraft.net
Can you buy them in addition or do I have to buy the whole game for 20 euro?
For that you need the Java version. But there are also servers that also have a PE or Windows 10 version
These are two different games. The Java version costs 24 euro
Is that synonymous with mmoga?
As long as you run the Java edition, MMOGA also works: https://www.mmoga.de/Game-Keys/Minecraft.html