Minecraft msg with color CommandBlock command?

How can I command the command block to send e.g. A red message to everyone?

§ this character and then a number, which is red, I don't know

You can do this with the Tellraw command. I chose a generator for you:

https://minecraftjson.com/

The generated command then in the command block and everyone gets the message.

Have fun!

Thank you!

With pleasure,

But make sure that you take "@a" as a player - not everyone gets it with "@p".

Best wishes!