Whenever I have a question/problem such as yours, I read the user's guide (aka ';the manual';).
It is amazing just how much I always learn from that.
If that doesn't help (or if I'm interested in a product I don't own), I check the manufacturer's website.
They have descriptions and specs for their gadgets, often have user forums, and the decent manufacturers all let you download the manuals in electronic form (so losing the book is no longer a problem).
99% of the time that does the trick.
Make sure to always set your camera to best quality (i.e. lowest compression rate) and biggest size (highest resolution).
The reasons for that include:
1) If you have a good, large photo, you can crop it more later on without losing too much detail if you really have to.
2) If you happen to take the best photo you ever took, you'll be able to print it at a large size. If you lowered size and quality, you'd be kicking yourself.
3) If you decide later you really don't want to keep a big file, it is very easy to down-size it in post processing - but you can't go the other way, you can't invent pixels that weren't there in the first place.
4) Memory cards are cheap, so are bigger hard drives. There is NO reason to do anything less than the best.
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