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Hello! Please help me understand the following: I can't figure out which characteristics are increased by education. It says that the main ones are... but what are the main characteristics, and how much do they increase depending on the skill level?

The main characteristics increase by +1 for each level (1 characteristic increases per level):

attack
defense
spell power
knowledge

In addition, education affects experience.

The main attributes increase by +1 for each level (1 attribute increases per level):

attack
defense
spell power
knowledge

In addition, education affects experience.

So, with maximum education level, will I get +4 to each main attribute?

So, with maximum Education skill level, will I get +4 to each primary stat?

Have you tried reading the Heroes manual? ;)

Have you tried reading the game manual? ;)

This isn't in the manual; it states that with maximum Education, a hero receives +1 to one of the primary stats for every 2 levels.

Therefore:
1. A level 30 hero will receive +15 to...
To what? To one specific, dominant stat (Attack for Orcs, Defense for Knights, etc.) or randomly for each bonus point?
2. Where are these bonus points displayed? The hero's primary stats are the same with and without Education (if we don't consider "Endurance" in Education: +2 to Defense, and similar).
3. If you reset the Education skill with a mentor, the bonus stats should disappear, but no changes are observed...

Added after 18 hours and 51 minutes
I almost found the answer to the first point:

Therefore:
1. A level 30 hero will receive +15 to...
To what? To one specific, dominant stat (Attack for Orcs, Defense for Knights, etc.) or randomly for each bonus point?

When leveling up, you get +1 to one of the 4 stats (Attack, Defense, Magic, Knowledge) randomly. However, for each class, there is a probability of each of the 4 stats being chosen, so Barbarians are more likely to get Attack, and Necromancers are more likely to get Magic.
With Expert Education, every second level will grant two points to stats.
HOWEVER, THE QUESTION IS:
Do these two points have a common chance or are they independent? That is, if the "die" rolls for Attack, does the hero get +2 to Attack, or does he get +1 to Attack, and the "die" is rolled again for the second point?
And how are the bonus points for already gained levels determined?

Logically, there should be a separate chance for each point. So, if a level 30 hero suddenly gains Expert Education, he will receive 15 bonus points, and a "die" should be rolled for each of them to determine which stat this point goes to. But that's just logic, my logic, and it may differ from the developers' logic and the game's logic in general.
I would like to know reliable information because Education is a rather controversial skill...

I would like to know the reliable information, as education is a rather controversial skill...

There is nothing controversial about this skill - well, except, of course, for the skills within education itself (for example, a barbarian scholar - this skill is practically useless).
Otherwise, reliable information about the specific distribution of points to attack, defense, magic, and knowledge for a specific hero on a specific map can be easily obtained by running a scanner.