>What's the difference between Mandrake, RedHat and Suse?.. and what's the best one? Where I can download full documentations including installation guidance?
>
>TQ

TQ,
That's the kind of question that starts 'religious' wars because people generally become attached to the distro they like and defend it against all negative accusations.

But, walking in where angels fear to tread....
RedHat was the first Linux distro (distribution) to use Microsoft-like marketing tactics. As a result it has a significant 'brand image'. However, it hasn't invested as much into its quality as it has its Public Relations. The last several releases have generally been buggy. So buggy, in fact, that Mandrake was started to 'fix the bugs'. So, for a while, Mandrake was built on the latest RH version, creating distros that RH should have released in the first place. Mandrake gained a good following because of its quality. But, alas, in recent version of Mandrake they have attempted to create their own 'brand recognition' and in doing so made the mistakes that RH made, by letting their market droids dictate their release schedules. (Some economics is probably involved in that too, because the more releases they have the more income they produce.) Mandrake, too, is now plagued by stability and bug issues. I started with RH 5.0 in 1997 and later that year switched to SuSE 5.3. I've been with SuSE every since, primarily because they have continued to release high quality distros. Some, however, have detected quality slippages in version 6.4 and 7.0, although I haven't. The most stable and highest quality Linux distro is probably Debian, probably because they do not release new versions as often, stay away from the 'bleeding edge' and don't update to the latest versions of apps like KDE, etc... As a result, they trade being current for stability. (I am not mentioning FBSD because they have maintained an aloof and elitist attitude and only recently have become consumer friendly as they saw their market share dwindle to the point of becomeing insignificant. Their distro is not based on the Linux kernel, however, and I hear there are compatibility problems, but I could be wrong on that score.)

So, in my opinion, the top distros are Debian and SuSE, with Mandrake and RH following in the rear. This could change in a single release, however, because quality is only a few months of "concern for excellence" away.

In the long run, if you are willing to do your own maintenance ('religiously' applying patches, fixes, etc...) any distro is good. Some, like Debian and SuSE are easier to maintain than others. If you have a fast broadband connection to the Internet then Debian is probably the easiest to keep current because it involves automatic upgrades, and the upgraded packages are usually well tested, also meaning that they are not on the bleeding edge.
If bleeding edge is what you want then it doesn't matter what distro you use, you will be doing all the work and your distro will rapidly become out of sync with the base version.

Some folks build their OWN distro from sratch, following the instructions given at the http://www.linuxfromscratch.org website.

See why Linux is so much FUN, and the BEST OS on the planet!!!