The bad news about the modern world is that, thanks to tech, things are changing so fast you're almost certainly going to have to keep updating your skills throughout your career if you want to be successful. The good news? Thanks to tech, it's also easier -- and cheaper -- to do that than ever before.

I am talking, obviously, about the incredible wealth of free or close to free online courses out there. You can already learn just about anything, from Renaissance art to programming in Python, via MOOC (for the uninitiated, that's Massive Open Online Course). But as rich and varied as these online offerings already are, Dhawal Shah, founder of online learning portal Class Central, insists we're just getting started.

He recently shared a whopping 600 new courses that have launched in just the past four months alone on Quartz. There's everything from an art history class about an English castle to a deep dive into space shuttle engineering. But here for business-minded Inc.com readers are all the business classes (minus the foreign language options, though French, Russian, Chinese, and Spanish speakers can check out the complete list).

1. Improving Your Business Through a Culture of Health from Harvard University

2. Introduction to Systematic Reviews from Stanford Medicine

3. The Role of Impact Assessments in Real Estate Development from Massachusetts Institute of Technology

4. Creating Shared Benefits in Real Estate Development from Massachusetts Institute of Technology

5. FinTech Law and Policy from Duke University

6. Auditing I: Conceptual Foundations of Auditing from University of Illinois at Urbana-Champaign

7. Auditing II: The Practice of Auditing from University of Illinois at Urbana-Champaign

8. Managing My Money for Young Adults from The Open University

9. Using Email for Networking in English from University of Washington

10. Safety in the Utility Industry from University at Buffalo

11. Energy Industry: The Enterprise from University at Buffalo

12. Agile Meets Design Thinking from University of Virginia

13. Customer Segmentation and Prospecting from Northwestern University

14. Building a Toolkit for Your Sales Process from Northwestern University

15. Sales Pitch and Closing from Northwestern University

16. Connecting with Sales Prospects from Northwestern University

17. FinTech Security and Regulation (RegTech) from The Hong Kong University of Science and Technology

18. FinTech Risk Management from The Hong Kong University of Science and Technology

19. Market Segmentation Analysis from University of Queensland

20. Influencing Stakeholders: Dealing with Power and Dynamics in Teams and Networks from Delft University of Technology

21. Waste Management and Critical Raw Materials from Delft University of Technology

22. Sustainable Packaging in a Circular Economy from Delft University of Technology

23. Effective Decision Making: Dealing with Business Complexity from Delft University of Technology

24. Electric Cars: Business from Delft University of Technology

25. Measure and Improve Innovation at the Workplace from Universitat Politècnica de València

26. Foreign Exchange Markets: Concepts, Instruments, Risks and Derivatives from Indian Institute of Management Bangalore

27. Special Topics in Risk Management of Banking and Financial Markets from Indian Institute of Management Bangalore

28. Banking & Financial Intermediation: Concepts, Risks, Capital & Regulation from Indian Institute of Management Bangalore

29. Risk Management in Banking and Financial Markets Professional Certificate Exam from Indian Institute of Management Bangalore

30. Money & Debt Markets: Concepts, Instruments, Risks and Derivatives from Indian Institute of Management Bangalore

31. Equity Stock Markets: Concepts, Instruments, Risks and Derivatives from Indian Institute of Management Bangalore

32. Intelligence Tools for the Digital Age from IE Business School

33. Social and Digital Media Analytics from Purdue University

34. Introduction to Strategic Doing: An Agile Approach to Strategy from Purdue University

35. Designing and Implementing Effective Entrepreneurship Policies from Politecnico di Milano

36. Financial Regulation in Emerging Markets and the Rise of Fintech Companies from University of Cape Town

37. Executing Breakthrough Innovations with the Three Box Solution from Dartmouth

38. Developing Breakthrough Innovations with the Three Box Solution from Dartmouth

39. Influencer Marketing Strategy from Rutgers University

40. Supply Chain Analytics Essentials from Rutgers University

41. Culture of Services: Paradox of Customer Relations from Kyoto University

42. Finance for Startups from Korea Advanced Institute of Science and Technology

43. Advanced Valuation and Strategy - M&A, Private Equity, and Venture Capital from Erasmus University Rotterdam

44. Organisational design: Know your organisation from Macquarie University

45. Organisational behaviour: Know your people from Macquarie University