What is the difference in belief between the Kurds, Shiites, Soenites?

Why are these muslim groups fighting against each other? Is the fundament dfor these fights the differences in their religion or are ther other difficulties and problems between these groups? Are the Kurds, Shiites, Soenites the only directions in Islam or are there still other sects? Where can I find a... show more Why are these muslim groups fighting against each other?

Is the fundament dfor these fights the differences in their religion or are ther other difficulties and problems between these groups?

Are the Kurds, Shiites, Soenites the only directions in Islam or are there still other sects? Where can I find a overview of these groups and the differences between them?
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