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I'm a beginner, but maybe someone will find it interesting, and I'll learn something myself.
Hero:
Mag-Nazir
Chaos Magic: Fire Mastery, Chaos Secrets, Pyrokinesis
Sorcery: (If you have enough mana, you don't need to learn it) Mana Regeneration, Wisdom, Secret Revelation (if you don't have mana problems), Diversion
Education: Further development depends on your preference.
Troops: Much depends on how lucky you are with resources.
Goblins: An essential unit; they work very well in combination with Golems.
Gargoyles: They enhance fire magic and are a very good shield for absorbing attacks; many battles are won solely due to these glorious creatures. Golems: Upgrading them is often impossible due to a lack of resources, but if you're lucky, they should become the foundation of your army. Djinns: An extremely weak unit. Usually, you won't reach Rakshasa in a 1-on-1 battle.
Playing as Nazir is difficult at the start because mana runs out very quickly. But once you have +5-7 knowledge in your stats, everything improves. Ideally, you shouldn't build a library higher than +1 in your city. You already have a core skill; you just need to develop it to Pyrokinesis. I develop it in conjunction with Sorcery. Once you leave the city, you don't need to return to it. Use Goblins to bring reinforcements. Head to the center of the map and disrupt the enemy. If you succeed (and you should), you can try to storm a Castle. If it doesn't work on the first try, fly back home, learn new spells. If the city is empty, but the enemy has gathered a significant army, it's not worth defending the city; it's better to buy another hero and have your main hero engage the enemy in battle.
Added after 22 hours 13 minutes
Another hero is very good for rushing, although in that case, I prefer Elves, but he's also very good. The start is very easy, and with a bit of luck, you can achieve very good results.
So, the hero is Hafiz.
At the start, you get a lot of Goblins, but after my experiments, it's better to buy mages first and then upgrade the Goblins. And it's best to upgrade mages at the beginning. There are some nuances when leveling up against fat but slow mobs; mages run out of MP very quickly, which can lead to losses that shouldn't happen. I like to develop Summoning magic the most in this case; you can easily get Elementals without even approaching a Castle and without wasting time. Summoning Magic, Master of Summons, Fire Wars, and your skill.
Also, you often find a ring with Elementals. I don't see the point in developing Light Magic; buffs don't apply to Ballistas, and the mage's army isn't very good. Dark Magic: If possible, there are often problems with spells, so why not? Although I tend to favor Summoning Magic.
So, here's what you should aim for:
Expert Mechanical Engineering: First Aid, Ballista, Rapid-Fire Ballista
Expert Summoning Magic: Master of Summons, Fire Wars, Earth Lord
And about 140 Goblins ^___________^, which will fight very well.