The "console" is where you can see the output of your code. In Repl, you should see a console on the right.
console.log(). You just need to put any text inside quotes, inside the parentheses, and when you run the code you should see that text printed to the console.
Write this in your Repl:
Click "run" and check the console. You should see "Hello world!" printed out on the right hand side. It'll look something like this:
Don't worry about the
undefined. That will go away when we start writing more complex code.