Success

Success, there are lots of necessary factors but the most important is skill, some people are just born with a gift for something, hard work helps, but without some skill, you will never reach the level of a skilled hard working person. Next comes opportunity, sometimes if you are born in a certain family the universe will align you with someone or something to bring you success. Hard work is a necessary factor, you aren't going to get anywhere without working at it unless it is just handed to you, which is a very slim chance. Lastly, luck, you need some luck but opportunity is kind of the same thing so luck on it's own isn't a huge deal.

Skill
Opportunity
Hark Work
Luck