As a Linux-Novice (as the user name suggests), what would you recommend to maximize security? I don't feel like the Ubuntu dev's are focusing enough on security

As a Linux-Novice (as the user name suggests), what would you recommend to maximize security? I don't feel like the Ubuntu dev's are focusing enough on security and simply banking or hedging on Windows being the main target for hacking. Ideally, I would want to know how to install grsecurity on a Mint distro and try and configure the settings myself. Any tips appreciated.