A few simple practices you can apply that will take you towards the goal of bulletproof-security.
The subject of security will be everlasting, as long as the internet and people exist. Security will never be satisfied; after all security is a learning, changing, fluid process. There are however, a few simple practices you can apply that will take you towards the goal of bulletproof-security. This is not a complete list, but something to get you started.
Other best practices for reference: www.cyberciti.biz/tips/linux-security.
In reality, this list should be 3 times longer and include multiple solutions. Those are, however, the simplest things we chose to get you going. Let us know in comments if you think this basic list is missing something!