Nav-link corresponding bug

my .nav-link corresponding with .main-section id but doesn’t work…

Help pls :’(

maybe the problem is with uppercase and lowercase,
For example in header named Java you have id java(lowercase j).
Check with the user stories… If they are case sensitive or not

For test #4. The id, href and header text needs to match. For example, you have id="objective but the header text is Objective-C, the same goes for the id="ref" section.

thanks yu right for the #4