Continue playing Minecraft save game on another PC without a USB stick?

I need to know how to quickly transfer files in Minecraft to another pc because I don't want to transfer it with a USB stick every time I'm on another pc. Can't I just send it to me? With any platform? I'm happy about every answer!

You could simply syncronize the savegame with a cloud platform on both devices and that's good.

But when I have the score on two PCs it is not the same afterwards

Can you change that?

That's why I say yes: Sync.

Both devices are synced to the cloud.

All three devices always have the same status (two computers and one computer in the cloud

Thank you you helped me (-: :-)