で is used to mark the location of an action. 家で雑誌を読みます。Ie de zasshi o yomimasu. | I read magazines at home. 学校で勉強した。Gakkou de benkyou shita. | I studied at school. Beginners often mistake で (de) and に (ni). Make sure if you’re talking about an action taking place, then use で , whilst a non-action related location is に ni.