Parsing error! I am at the beginning of a course and struggling to evolve, plese have a look

Here is my code, I would like some help please to find out why is it not working.
The course I am takeing is not up to date and probablly as the languages have evolve there are some errors along the way.
I want to find out if this is true and how can I keep up too date .
Thank you!
This is the code bellow :

// If we click on the start /reset button 
// If we are playing 
// Reload page
// If we are not playing
// Set score to 0
// show countdown box    
// reduce the time by 1 second in loops 
// time left?
// YES -> Continue 
// NO <- Game Over! 
// Change button to reset 
// Generate Q & As

// If we click on an answer box 
// If we are playing 
// Correct? 
// Yes 
// Increase score  
// Show Correct box for 1 second 
// Generate new Q & As 
// No
// Show Try Again box for 1 second


function () {
    "use strict";
}
var playing = false;
var score;
var action;
var timeremaining;

document.getElementById("startreset").onclick = function () {
   
    if (playing === true) {
        
        location.reload();
    } else {  
        playing = true; 
        score = 0;
        document.getElementById("scorevalue").innerHTML = score;
        
    
       
        show("timeremaining");
        timeremaining = 60;
       
        
        document.getElementById("timeremainingvalue").innerHTML = timeremaining;

        
        hide("gameOver");
    
   
        
        document.getElementById("startreset").innerHTML = "Reset Game";
       
        startCountdown();
         
       
        
        generateQA();
    }
}

       
function startCountdown() {
    action = setInterval(function () {
        timeremaining -= 1;
        document.getElementById("timeremainingvalue").innerHTML = timeremaining;
        if (timeremaining === 0) {  
            stopCountdown();
        }
        show("gameOver");
        document.getElementById("gameOver").innerHTML = "<p>Game over!</p><p>Your score is " + score + ".</p>";
        hide("timeremaining");
        hide("correct");
        hide("wrong");
        playing = false;
        document.getElementById("startreset").innerHTML = "Start Game";
    }, 1000);
}

function stopCoutdown() {
    clearInterval(action);
}



function hide(id) {
    document.getElementById(id).style.display = "none";
}



function show(id) {
    document.getElementById(id).style.display = "block";
}



function generateQA() {
    
}

thank you for your time kind Sir
The code I have showed you is part of the course that i am doing, and this part is actually a math game. in order for you to have a more detailed perspective on what I am working at, I should give you a link, but since I am not aloud to at this stage, I will just write to you the complete code in separate stages/ languages .
I tried to do it now , but it doesn’t allow me to reply because it says there is a link inside the text.
How can I show it to you in a different way?

Thank you again for your time!

Thank you, I will try that then.

I can’t just copy paste the code somehow, instead of writing it again in Codepen?

I have managed to add the jsbin file link into the description of html in Codepen. Please check it there !

Sorry, forgot to leave you the name Dragos2 !

the error was is shown inside brackets, in the js file. at this point of the code, there are supposed to be active several features of the game, instead nothing actully works, none of the features. I am just trying to find out why, and how, and if I need a different course for javascript, as it might be absolite.

this are the errors :
JSLint
25.Missing name in function statement.
25. Stopping .(22% scanned)
ESLint
ERROR: Parsing error: Unexpected token ( function () {
If I delete the use strict function I have much more errors.
I hope this answers your question

you should be able to copy the code from the JSbin and paste it in your software(in my case brachets) and then try and run it so you can understand wich are the features that are unusable .
the code should work as a game, and at this stage it should start a timer when you press start, and the start button to change to reset and when the timer comes down to 0 shoul appear a box that shows you the score and the mesage “GAME OVER” , but unfortunately none of the features work.
I don’t know how to add screenshots or videos here .

you can chech again in Codepen and access the link again as I made some alterations.

I know but, that would take a lot of time, as I am a beginner and I don’t write that fast, so if you would be so kind and access it from the jsbin.