iCloud Photos Mac and iPhone Storage question
I have just started using iCloud Photos and have a few questions about storage. I understand that my photos from my iPhone are stored in iCloud as well as on my phone so that they can be views on my MacBook as well, however does that mean that they end up being stored on my MacBook as well, up until I run out of space when iCloud will then optimise storage? I have lots of photos on my phone and not much space on my MacBook so its not much help if using iCloud is going to mean I end up with local copies on my laptop as well.
Thanks
MacBook, macOS 10.14