The best side hustle, in-demand job skills, and traits of highly successful people are revealed by Mark Cuban.

Mark Cuban knows what sets successful people apart from the crowd.

A 66-year-old Cuban entrepreneur is both a self-made billionaire and a longtime startup investor who has listened to many business pitches on ABC's "Shark Tank" and mentored dozens of entrepreneurs he has helped fund.

According to CNBC Make It, Cuban believes that the core traits and strategies that lead to success haven't changed over time. He states that the skills required for a job today, in 10 years, and even 100 years from now are always the same.

Mastering a specific set of hard and soft skills can help you land a coveted job, negotiate like a "Shark Tank" investor, or launch a successful side hustle, according to Cuban.

Here are three pieces of advice from the billionaire:

Focus on 3 soft skills to land a job

Cuban suggests that when the job market seems overwhelming, you can rely on the same three soft skills: agility, curiosity, and adaptability.

"I can pretend to predict the future of AI and its impact on the job market, but I'd be lying," he admits. "I don't know for sure, but I will stay attentive, adaptable, curious, and open to change."

Currently, recruiters are placing a high value on adaptability, as it has been deemed "essential for both individuals and organizations" according to a LinkedIn blog published in February. Individuals who are highly adaptable are typically able to quickly acquire new skills, apply old skills in innovative ways, or feel confident while navigating rapidly evolving social norms.

"Building adaptability is crucial for managing change, according to Aneesh Raman, LinkedIn's chief economic opportunity officer."

Pick up these 2 crucial negotiation skills

Negotiating effectively can help you achieve your goals, whether it's requesting a promotion or resolving a disagreement with your partner about takeout options.

The best dealmakers are patient and don't try to win every deal point, Cuban says. They understand that sometimes it's necessary to give something in order to get the deal done.

Cuban frequently remains silent on "Shark Tank" to allow his fellow panelists to express their opinions and questions to the business owners seeking funding. This strategy enables him to reflect on their insights and develop a more comprehensive plan of action.

"Shark Tank" is a TV show where entrepreneurs pitch their business ideas to investors. When someone walks in and I'm not interested, I think to myself, "There's no way I'm interested." However, if I don't have all the necessary data to make a decision, I say, "I don't have quite all the data that I need to make a decision." Cuban, the founder of ABC Unlimited Partners, said in an interview with former FBI hostage negotiator Chris Voss last year that when he listens to the other Sharks, they'll tell him if he has any competition financially to do a deal. They'll also teach him things about the industry and the person.

Turn up-and-coming trends into side hustles

In 1990, Cuban made a millionaire by selling MicroSolutions, a software company he founded, as personal computers gained popularity in American homes. He later became a billionaire by selling Broadcast.com, his audio streaming service, to Yahoo in 1999, before the content-streaming boom.

Cuban believes that AI is the current manifestation of trends. If he were a teenager today, he would utilize language models such as OpenAI's ChatGPT or Google's Gemini to generate additional income. He would establish his side business in just three simple steps.

1. Learn how to write prompts for AI chatbots.
2. Teach his friends how to use those prompts for their school papers.
3. Apply that same skillset to businesses, particularly small- to medium-sized businesses that lack understanding of AI.

"Cuban states that age is irrelevant, as he would still be teaching businesses regardless of being 16."

AI prompt engineering is a lucrative career that doesn't require a college degree: According to ZipRecruiter, the average pay for AI tutors is around $30,000 per year, and full-time AI prompt engineers can earn up to $129,500.

CNBC has the exclusive rights to air "Shark Tank" off-network.

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