You always can search for older answers to the same step in this Forum. Top right small menu, at left of your avatar.
The following link is my recent answer to another person about step 11, I think it could help you as well.
I recommend you read everything carefully, even the code there and the error messages, it helps during the learning process as well. Don’t rush. The speed come with practice. Even check the concepts you don’t understand.
You could check the options you have when you write a post, menu at the top of the box in desktop; pretty cool.
I’ve edited your code for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.
You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.