It varies with the browser so google like this.
At google.com, ask the question in your post, then add Windows 8 then the browser you use.
For example.
https://www.google.com/#q=how+to+clear+cache+windows+8+firefox
I am having trouble with certain sites which use cookies and java script. I was told to clear the cache on my laptop. I have HP Pavilion 2000 using Windows 8. How do I clear the cache and how would this help? Also certain pages get blocked, although on my settings I put not to block pages without security certificates. How to unblock these pages?

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