I don't even know what is wrong with the code

Tell us what’s happening:
Describe your issue in detail here.

Your code so far

const myStr = " This is the start. " + "This is the end"; // Change this line

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User Agent is: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.115 Safari/537.36

Challenge: Concatenating Strings with Plus Operator

Link to the challenge:

you have an extra space at the start

You also are missing punctuation at the end of the second sentence.