Over time, your PC can quietly fill with needless junk without your even realizing it, as the Recycle Bin and temporary files suck up your storage. Storage Sense helps combat the creep. Head to 'Settings->System->Storage' and enable the Storage Sense option to have Windows start automatically clearing out unneeded temporary files, and deleting any files in your Recycle Bin over 30 days old. You can tweak those options using the 'Change how we free up space' link underneath the option.
The October 2018 Update added the ability to have Storage Sense send long-untouched files from anywhere on your computer to your OneDrive cloud storage, freeing up space on your hard drive. It could be a useful addition if you're close to filling up your local storage, but keep an eye on your available OneDrive space-cloud storage isn't free. Fortunately, the feature includes granular controls.