what's the difference between Red Hat Linux and Mandrake Linux?
Due to this ( Posts: 2 ) I am guessing you are trying to choose one to try on your computer. The best way (for new or old Linux users) to see any differences in distributions is to try them both. A very large percentage of applications are basically the same on every distribution. Each distribution may have a different default window manager, and usually have a different set of administration tools. Some may include more or less applications in their various offerings.
Both Mandrake and Red Hat have their pluses and minuses. Personally I would prefer Mandrake, but that is due largely to my particular hardware. Barring hardware problems just make a choice and use if for a while and see what you think.
Depending on your pocketbook or internet connection you can; download either for free (the box versions are a little more complete on default install); buy the download versions cheaply at Cheapbytes, Linux Central, etc; buy the cheaper box set offered (not a bad choice, it includes some printed documentation (usually available online if you are going the cheap way) usually a more satisfying install (Acrobat Reader and such included); or go whole hog with a complete set.
I doubt I am answering what you want answered, but maybe this helps.