The following steps will help you to install an Apache web server with PHP and MySQL on your Amazon Linux 2 instance.

I took help of following links to create this guide:

• https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-lamp-amazon-linux-2.html
• https://techviewleo.com/how-to-install-mysql-8-on-amazon-linux-2
• https://medium.com/@hbayraktar/how-to-install-laravel-5-on-amazon-linux-2-303ef2d38fa4

1. Launch EC2 Instance:
   • Sign into your AWS account and go to "EC2" service section.
   • In "EC2 Dashboard" click "Launch Instance" button.
   • Select "Amazon Linux 2 AMI (HVM)".
   • In next screen, select appropriate instance type. You can choose the one which is marked "Free tier eligible" to get started. This can be changed later.
   • Click "Review and Launch" button.
   • During this process, you will asked to select a "Key Pair" to use with this instance. You can either use an existing key pair or create a new one.
   • Download the key pair that you selected. Let's say you saved it with name myserver.pem
   • Launch the instance.
2. Install Apache/PHP/MySQL:
   • On your local system, using the terminal, navigate to the directory where you stored the myserver.pem file.
   • Update permissions for this file - chmod 400 myserver.pem
   • SSH into your instance using following command:
     • ssh -i "myserver.pem" ec2-user@{your public dns}
       • You can get the public DNS by selecting your instance in the "Instances" page
       • 
     • Example:
       • ssh -i "myserver.pem" ec2-user@ec2-xx-xx-xx-xxx.compute-1.amazonaws.com
   • Update your instance:
     •  sudo yum update -y
   • Install MySQL:
     • Add MySQL Yum Repository to Amazon Linux 2
       • MySQL 8:
         • sudo yum install https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm
       • MySQL 5.7:
         • sudo yum install https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm
     • Press the y key when prompted to start the installation.
       • A new repository file has been created inside the /etc/yum.repos.d directory.
     • Install MySQL 8 on Amazon Linux 2
       • sudo yum install mysql-community-server
     • Start and Configure MySQL 8 on Amazon Linux 2
       • Start MySQL server - sudo systemctl enable --now mysqld
       • Confirm if MySQL server service is started and running - systemctl status mysqld
     • A superuser account ‘root’@’localhost is created with initial password set and stored in the error log file. To reveal it, use the following command:
       • sudo grep 'temporary password' /var/log/mysqld.log
         • It will show output such as:

           • A temporary password is generated for root@localhost: ABCD1234

       • Use this password to setup a new password and other MySQL security settings:
         • sudo mysql_secure_installation -p'ABCD1234'
   • Install Apache:
     • sudo yum install -y httpd
     • Start apache web server - sudo systemctl start httpd
     • Setup apache server to start on each system startup - sudo systemctl enable httpd
     • You can verify that httpd is ON - sudo systemctl is-enabled httpd
   • Install PHP:
     • sudo amazon-linux-extras install -y php7.2
     • Install other PHP packages:
       • sudo yum install php-cli php-xml php-json php-mbstring php-process php-common php-fpm php-zip php-mysqlnd git -y
     • Check installed PHP version - php --version
   • Make sure that the security group used by the instance allows HTTP traffic (port 80)
     • https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-security-groups.html#adding-security-group-rule
   • Go to your Public DNS, it shall show Apache test page similar to following:
     • 
3. Add/update files to document root:
   
   • By default Apache document root directory is /var/www/html and ec2-user doesn't have permissions to update files in this directory.
   • To allow ec2-user to make changes to this directory, we need to change the ownership and permissions of this directory.
   • We will add ec2-user to apache group and then give apache group ownership of the /var/www directory
     • sudo usermod -a -G apache ec2-user
   • Logout and SSH to your instance again 
     • exit
     • ssh -i "myserver.pem" ec2-user@ec2-xx-xx-xx-xxx.compute-1.amazonaws.com
   • Verify that you have been added to apache group:
     • groups
       • It shall list apache in the groups list, such as:
       • ec2-user wheel apache
   • Change ownership of /var/www directory
     • sudo chown -R ec2-user:apache /var/www
   • Provide write permissions to the group
     • sudo chmod 2775 /var/www
     • find /var/www -type d -exec sudo chmod 2775 {} \;
     • find /var/www -type f -exec sudo chmod 0664 {} \;
4. Test your LAMP server:
   • Create a PHP file named phpinfo.php in your server's document root /var/www/html/phpinfo.php
   • It shall just have following content:

     • <?php
       phpinfo();
       ?>

   • In web browser, visit above file using the public DNS of your instance such as:
     • http://ec2-xx-xx-xx-xxx.compute-1.amazonaws.com/phpinfo.php
       • You should see PHP info page similar to following
       •