fix hacked wordpress site will also inform you that there is no htaccess within the directory. You may place a.htaccess record into this directory if you want, and you can use it to manage usage of this wp-admin directory by Ip Address address or address check this range. Details of how you can do this are plentiful around the internet.
Use strong passwords - Do what you can to use a password, alpha-numeric. Easy to remember passwords are easy to guess!
Keep your WordPress Installation up to date - One of the easiest and most valuable tasks you can do yourself is to make sure your WordPress installation is updated. WordPress gives a notice on your dashboard to you, so there's really no reason.
Install the WordPress Firewall Plugin. This site plugin investigates web requests to recognize and stop attacks.
There are always going to be risks being online (or even just being alive!) Also it's easy to get caught up in the fear. We put the breaks on, when we get caught up in the panic. This isn't a good response. Just take some common sense precautions, then forge ahead. If something does happen, it will need to be addressed then and no amount of quaking in your will have helped. All is good, if nothing does and you haven't made yourself sick with worry.