Sorry to hear that! Sadly, we didn't have time to create normal tutorial which our game obviously needs.
Type of tasks actually are not straight connected to employees stats, it's more of a efficiency stat. For example, task in backend for adding some new feature will be done most efficiently by employee with backend specialization and big creativity. As for the red cover on employee pictures you were right, that's burnout/stress. It gains if employee is working on task that not well suited for him(not efficient).
Anyway thanks for giving our game a try, we appreciate it!