Hi @HammadGSW and welcome to the Glitch community! 
When you created your Scorestream widget, it said this underneath:
Widget will fill its html container. Make sure the container has a valid width and height.
So basically, you need to put a div
or other element around your second widget, and set some dimensions with CSS.
You also have one in the nav. The nav can be styled directly with CSS. (I will show how in a moment)
When I remixed your project and started to fix it, I noticed that you have stripped down the HTML a bit too much. You need to keep a head
and body
section in your HTML, as well as the DOCTYPE
tag and some meta tags. This will help it to render properly on PC, Mac, iOS and Android in different countries.
<!DOCTYPE HTML>
<html>
<head>
<title>Scores</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
CSS here
</style>
</head>
<body>
Your code here
...
Lastly, when you have two widgets, you only need to keep one of the script imports:
<script async="async" type="text/javascript" src="https://scorestream.com/apiJsCdn/widgets/embed.js"></script>
Because they are both the same! So you don’t need to repeat it 
So, putting it all together:
Full code
<!DOCTYPE html>
<html>
<head>
<title>Scores</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<style>
nav {
height: 100px;
}
.container {
height: 600px;
width: 400px;
}
h1 { text-decoration: underline; }
h1,h2,h3,h4 {
text-align: center;
font-style: italic;
}
</style>
</head>
<body>
<nav>
<div
class="scorestream-widget-container"
data-ss_widget_type="horzScoreboard"
data-user-widget-id="44917"
></div>
</nav>
<h1>
GSW TRY YAH @SCORESTREAM
</h1>
<h4>I hope it works Inshallah!</h4>
<h2>THE SITE IS COMING</h2>
<div class="container">
<div
class="scorestream-widget-container"
data-ss_widget_type="vertScoreboard"
style="height:600px;"
data-user-widget-id="44922"
></div>
</div>
<script
async="async"
type="text/javascript"
src="https://scorestream.com/apiJsCdn/widgets/embed.js"
></script>
</body>
</html>
Here’s my remixed, fixed, Glitch project: https://glitch.com/edit/#!/sg-scorestream?path=index.html
You are learning and making a good start! But your HTML looks a little mixed up at times, like you have a h2
inside a h4
and you use a lot of <i>
and <center>
tags, which we don’t really do any more (we use CSS instead).
So I just want to direct you to my basic Let’s make websites article which has some introductory ideas for writing HTML on Glitch!
Have fun 