Skill, and luck have a geometric relationship. Your ability to "catch" success is the surface area formed by multiplying those together. The more of each you have the more likely you are to succeed.

Skill is reproducible. A successful entrepreneur can tell you what skills they have found useful in their successes. You can look at a bunch of businesses and figure out what skills are necessary. Luck is not reproducible. Far too many entrepreneurs discount their luck or lack the ability to recognize and analyze it.