Here's a clever map that has a training regimen to teach you how to kill max monsters with minimum casualties and other stuff.

http://heroes-iii.com/dl/h3basic.h3m

Heroes3 Basic Training Map
>> This is a training map made by Ironwill in the hopes of helping players learn a few basic things not taught in the tutorial of the game. Be sure to try out all 3 colors; Red, Blue and Tan as all 3 offer different training screnarios. You will learn the basics of chaining items to heroes, hero movement allowances, terrain and its effects on movement and combat in relation to different creatures and finally you will learn pretty much all stages of basic combat and proven strategies to lessen losses and extend your hero's fighting.

Interesting stuff.

That's a very helpful tutorial....learning a lot....thanks Artki :)