A lot of people have a problem with frizzy or flyaway hair, what can be done for this common complaint?

The main cause of these problems are lack of moisture. Hairs moisture level should be kept at am optimum 8%. However most hair has a moisture level of less than 2%. This is due to chemical or physical abuse. Or living in an arid climate. Naturally curly usually lacks moisture due to the hair cuticle being permanently lifted,

Are there any general products you can recommend? A good quality conditioner, Brazilian Blowout hair treatment or a Keratin Protein hair treatment will help.

What causes dry hair and are there certain kinds of hairstyles that could minimilize the problem?

To minimize the problem, wear a hairstyle that needs little or no maintenance and minimum or no combing. The style will depend on your hair type and texture.