If you are running low on storage space, your computer can help you locate where all your storage space is being taken up, as well as which files are taking up the most space.

Click the Apple logo in the top left corner, and select About this Mac. 

From there Select the Storage Tab:

On the next window, select Manage:

Once you reach the Management Screen, you can select the Review Files option to see which files you can afford to delete safely!