Why? and What?

Evangelism
The act of spreading the Christian gospel. 

Education
​Education is learning to know (truth), training is practical education, learning to do. Impartation of knowledge, truth, information. 
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Edification
​Morally or spiritually uplifting, improvement, instruction, etc.; verb: to instruct or benefit, especially morally or spiritually; uplift.

Equipping (the saints)
Definition: to furnish with intellectual or emotional resources; prepare.

​Encouragement 
​Synonyms: praise, support, boost, lift, endorse.
Definitions: to inspire with courage, spirit, or confidence: to stimulate by assistance, approval, etc.: to promote, advance, or foster.