Create FTP access for Lightsail LAMP Stack

Can you tell me how to achieve above please,,I am new to these commands and AWS lightsail,

You can add Linux users by following the steps in the document below. https://repost.aws/knowledge-center/new-user-accounts-linux-instance

sudo adduser new_user
sudo su - new_user
cd
mkdir .ssh
chmod 700 .ssh
touch .ssh/authorized_keys
chmod 600 .ssh/authorized_keys
cat >> .ssh/authorized_keys

The following command is a preparation to allow connection only to "/opt/new_user".

sudo mkdir /opt/new_user
sudo chown new_user:new_user /opt/new_user/
sudo chmod 755 /opt/new_user/

The following command creates a backup of "sshd_config" and opens the file.

sudo cp -pi /etc/ssh/sshd_confg /etc/ssh/sshd_config.bk
sudo vim /etc/ssh/sshd_config

When you open "sshd_config", add the following settings to the last line.

Subsystem sftp  internal-sftp
Match User new_user
    ChrootDirectory /opt/new_user
    X11Forwarding no
    AllowTcpForwarding no
    PasswordAuthentication yes
    ForceCommand internal-sftp

After saving the file, restart the SSH service with the following command.

sudo systemctl restart sshd.service

By following the steps above, you can create a user who can only connect to "/opt/new_user" via SFTP.