Event
Unit Learns a skill
Cond
Learned skill == '...'
Actions
Add 5 str to Triggering Unit -->this one is under 'Hero'
**OR**
Actions
If Learned Skill Level == 1
Add Attribute bonus to Triggering Unit
Else
Increase level of Attribute bonus for Tiggering Unit
--> these are under 'Unit'
This is very basic. Please learn, experience before asking...