2D tutorial

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MonoGame.Samples/Tutorials/learn-monogame-2d/src/16-Working-With-SpriteFonts/DungeonSlime/Content/fonts/04B_30.spritefont

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<XnaContent xmlns:Graphics="Microsoft.Xna.Framework.Content.Pipeline.Graphics">

In this section

Creating a SpriteFont Description
To use text in your game, you first need to create a SpriteFont Description file and process it through the Content Pipeline, thankfully the MGCB Editor makes this process straightforward.

For example, in the MGCB Editor:

Right-click the content project node where the SpriteFont Description will be created and choose Add > New Item....
Select SpriteFont Description (.spritefont) from the options.
Specify a name for the SpriteFont Description file and click Create.
This will create a default SpriteFont Description file that look something like this:

You forgot to mention that when running the MGCB editor you want to create a fonts folder. And give clearer instructions.