Most common WordPress (in)security issues
Downloading themes or plug-ins from some random place on the internet and not the official and reliable sources, or developers, will maybe save you some money but what ends up happening is you can end up installing all sorts of spyware on your web domain, not to mention the code quality that can be poor and potentially harmful for performance. Watch out for crappy themes and plugins and take the time to analyze the market that you are entering to get what you need for your WordPress.
