Can I use any american appliances/electronics in Europe with just a converter?

I am traveling to Europe and the Czech Republic. Will I be able to plug any american appliance/electronic in through a simple converter and use it? Or is there something else I would need to avoid "blowing up" my american appliances/electronics? In general, I would be plugging in hair appliances or a laptop or cell phone charger. If you have any recommendations on what converter etc. to purchase, I would appreciate the suggestions. Thanks!