How do I make space on my mac’s startup disk?

I already tried googling it and Apple suggested using the ‘manage’ button to manage my storage, but of course my computer doesn’t have that button? Also I have no idea what Other is and why it’s 96 GB so I can’t delete it because I don’t know what to delete. I can’t find where Movies is stored on my computer either, because whenever I search it in finder, it shows them to be but then I can’t right click, and on iTunes it says I don’t have anything in my movies library so I’m lost as to where they’re being stored on my computer 

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