Kash
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Here are a couple of magical links for you, dear friend, and may you find all the answers to your difficult questions there. Learn as much as you like if you have the desire to do so :).
1. Useful links from Evgeny – patches, map generator, etc.
2. PhysMiG by AmberSolera – practically all the physics of the Heroes world, everything about units, spells, etc.
3. A tutorial video on playing Heroes by Dirty – this is something you need to see.
4. And here's a wish from me =)