I tried using routerLinkActive and routerLink for my nav links and it affects the display of the navigation links.
=====app.component.html======
<app-navbar></app-navbar>
<div class="container">
<router-outlet></router-outlet>
</div>
====index.html======
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>AfrabUi</title>
<base href="/">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="icon" type="image/x-icon" href="favicon.ico">
<link rel="stylesheet" href="https://bootswatch.com/5/yeti/bootstrap.min.css">
</head>
<body>
<app-root></app-root>
</body>
</html>
=====Navbar component.html====
<nav class="navbar navbar-expand-lg navbar-dark bg-danger ">
<div class="container-fluid">
<a class="navbar-brand" href="#">
<img src="../../favicon.ico" alt="afrab chem logo">
</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav me-auto mb-2 mb-lg-0 navbar-left">
<li class="nav-item">
<a class="nav-link active" aria-current="page" [routerLink]="['/']" routerLinkActive="active" [routerLinkActiveOptions]="{exact:true}">Home</a>
</li>
</ul>
<ul class="navbar-nav me-auto mb-2 mb-lg-0 navbar-right">
<li class="nav-item">
<a class="nav-link" [routerLink]="['/about']" routerLinkActive="active" [routerLinkActiveOptions]="{exact:true}">About Us</a>
</li>
<li class="nav-item">
<a class="nav-link" [routerLink]="['/product']" routerLinkActive="active" [routerLinkActiveOptions]="{exact:true}">Products</a>
</li>
<li class="nav-item">
<a class="nav-link" [routerLink]="['/login']" routerLinkActive="active" [routerLinkActiveOptions]="{exact:true}">Login</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Logout</a>
</li>
<li class="nav-item">
<a class="nav-link" [routerLink]="['/register']" routerLinkActive="active" [routerLinkActiveOptions]="{exact:true}">Register</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Blog</a>
</li>
</ul>
<form class="d-flex" role="search" width="30">
<input class="form-control me-2" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success" type="submit">Search</button>
</form>
</div>
</div>
</nav>
I moved the routerLinkActive and routerLinkOptions into the li tags