By default, the latest version of WordPress is pretty secure. The development team of WordPress has considered anything that might have been added to some how to fix hacked wordpress plugins. In the past , WordPress did have holes but most of them are filled up.
A simple way would be to use a few tools. First of all, do not allow people run a web host security scan, to list the documents in your folders and automatically backup your entire web hosting account.
You should also place the"Anyone Can Register" in Settings/General to off, and you should have some type of spam plugin. Akismet is the old standby, the one I use, but there are lots of them nowadays.
Can you view that folder what if you go to WP-Content/plugins? If so, upload this blank Index.html file into that folder as well so people can't view from this source what plugins you have. Someone can use that to get access because even if your current version of WordPress is up to date, if you're using a plugin review or an old plugin using a security hole.
You do not always consider needing security, Whenever your website is new but you do need to protect your investment and yourself. Having a site go down and not having the ability to restore it can mean a loss of customers who can't find you and won't remember to search for your site later. Do not let this happen to you. Back up your site as soon as you get it started, as the site is operational and schedule backups for as long. This way, you will have peace and WordPress security of mind.