A good rule of thumb for checking if a shoe has the right size, is to have some room between your big toe and the shoe's front end that's about the width of your thumb. With this space you make sure your foot can slide a little bit inside the shoe when you walk with it.
Common mistakes are that people buy shoes solely because of the brand and for the style. And while these attributes are important as well you should really pay attention to the right fitting.
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