Hi Mr_Cat_Chap,
I'm Abram, fellow user and a independent advisor.
Nothing serious will happen if you clear the cache. Cache is a mechanism to load data faster. Say if you browse a page in your browser. Next time you again browse the same page.Then system will understand that you going to browse the page again and again.
You might also want to run a disk cleanup to optimize your computer.
https://support.microsoft.com/en-ph/help/404170...
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Hope this helps.