What skills can make you ultra wealthy?

Only the ultra-wealthy understand this:
Hard work alone does NOT generate wealth.
The notion that hard work leads to wealth may have held true in the past, but in today's rapidly evolving technology-driven world, relying solely on skill improvement will not lead to wealth creation.
Business leverage is needed.
If you don't understand this, your skills may make you rich, but it will be IMPOSSIBLE to accumulate weath.