The thing about websites is that even the smallest hole can be used against you. When the attackers get in, not only can they destroy what you’ve built but they’ll also have control over all data stored and transmitted through your pages. Depending on their objective, they might also decide to hold your site hostage, locking you out of everything.
These days, incidents like these aren’t as easy to avoid. The next best thing given such a scenario is for you to have a way to fix bugs when they present themselves. The more secure your site is, code-wise, the easier it will be for you to install a security detail. This system will not only work by protecting your page from suspicious access but also monitor these activities in an effort to pinpoint the source of potential attacks.