I made a list of skills in which I think every adult should gain a working...

I made a list of skills in which I think every adult should gain a working knowledge. I wouldn't expect you to become a master of any, but mastery isn't necessary. Luck has a good chance of finding you if you become merely good in most of these areas. I'll make a case for each one, but here's the preview list.
Public speaking
Psychology
Business Writing
Accounting
Design {the basics}
Conversation
Overcoming Shyness
Second language
Golf
Proper grammar
Persuasion
Technology { hobby level}
Proper voice technique