Security Issues that can be fixed but not totally according to your needs

[ghoshzsh]

1. Make a user and provide the password wherever it needs to use Sudo access. This may help to filter out anonymous users who you don't know. Give the password only to whom you know or make an option to sign in with Google and give them the password.
2. Stop everyone to install wget, curl, git,ftp,ssh etc that can stop unknown file upload and download.
3. Filter apt package manager to abort these tools to install
4. Ignore download this repo
5. If possible, avoid running Docker containers with the --privileged flag. Privileged containers might allow attackers to break out of the container and gain control over the host system. Grant containers individual capabilities with the --cap-add flag instead.
6. You can also use a proxy to hide your real public IP adress.