Info really needed on caches & cookies - please!

Whenever I read any article about 'How To clean Up your Mac' /'Make It Run Faster' etc it always mentions deleting caches & cookies. I have tons of each - how on earth do I know which ones it's safe to delete & which ones will kill my Mac if not there? I'm sure not, but is there any way to tell the difference? Ditto with histories....
Any help gratefully accepted - just moved from PC to Mac so I'm a bit dazed, to say the least.
Thanx,
Sammi Zdat

Personally, I make it a point to delete both cookies and caches daily; I usually leave any cookies placed by businesses I deal with (credit card companies, banks, Apple , my ISP, etc) because at least one business will have me go through hoops if they don't find their cookie when I log in. It takes a bit longer when you delete some instead of all, but I've gotten used to it.
If you use Firefox, click on Preferences, click on Privacy, and then click on "show cookies" and then click on "remove" highlighted cookies or "remove all". Cache is found under Preferences - Advanced - "clear now". You can also occasionally click on Tools (top menu) and click on "clear private data", that clears out everything (cache, history) except cookies. You can also set up Firefox (Preferences - Privacy - "Private Data") to delete whatever you specify under "Settings" every time when you quit Firefox.
If you use Safari, go to Preferences, click on Security, click on "show cookies". Same procedure (remove one or all). As for cache, click on Safari and click on "empty cache". You can also click on "Reset Safari" and specify what should be deleted.
Hope this helps.

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