Looking at your School or course guidelines, you will see that you get marks for things such as:
And that there are strict penalties for:
Correct citing and referencing will help with this and also help ensure that you aren't plgiarising.
Remember, the more you read from appropriate academic literature, the more you will see citing and referencing in practice. You can benefit from other people citing and referencing, by following up references from their reference lists. Examples of citing and referencing can be seen in the How? Citing and Referencing Styles section.