well, as per my knowledge,

sunni, means a person who believes in allah(swt) and prophet muhammed(pbuh), following the sunnah of prophet(pbuh), and also as well respect ali, hassan , hussain etc,

shia, they also have the same basic belief, but they give more importance to the 12 imams, people from prophets family, some shias are extremist and associated properties which can only be associated with Allah to these imams,

check out for bilal philips video on shia on youtube,

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i want to learn until i die, if u have some knowledge then share it with me.
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