Hi, @jagfan13
Welcome to the forum.
Please read the post at the start of any forum , entitled "How to use this Forum".
This will help with advice on how to present your code and problems.
Please post your code.
What model Arduino controller are you using?
What is you code supposed to do?
Which course, can you please post a link?
Go back and check each line with where you copied it from, there are some missing lines and too many comment /* */.
Tom...