My Hyperlinks are not working

Did you rename the files according to the instructions in the textbook? 

All of the starting exercise files are named "filename_txt.txt".  The instructions in the textbook are to rename the file to "filename.html" without the "_txt".  

When you are creating hyperlinks, you are linking to "filename.html".

If you did not fully rename your original exercise files according to the prompt and instead renamed them to "filename_txt.html", this is not the same file name as the code that you created is asking your web browser to request.

Please check your file names and ensure that the name of the file that you are requesting in the hyperlink is the same as the file name that the file is stored in your directory.