The Sims 4: Cottage Living helps kids practice and improve the following skills:

Self-Awareness: Understanding our own actions, thoughts and feelings.

A crucial part of The Sims 4 is emotions. Sims have feelings just like everybody else and the game is a great way to practice dealing with tough emotions. For example if your sim's chicken dies your sim will be sad for a while but if the player helps the sims handle their emotion through calling the sadness hotline or writing in their journal the sad emotion will end sooner. 

Planning: Developing a systematic approach for setting and achieving goals.

The Cottage Living Pack requires players to use their planning skills for a variety of activities. To complete the lifetime aspiration, Country Caretaker, players have to plan when to accomplish each step of the aspiration to complete it before their sim becomes an elder. Planning is also used when players use the Simple Living lot challenge which requires them to grow or buy the ingredients to cook. Players have to plan what crops to grow and animals to raise to solely live off the land.