The U.S. Bureau of Labor Statistics has a great archive of Career Outlook publications which could help during your career planning journey.
These publications address topics such as "Projected openings in occupations that require a college degree", "Linking college majors to careers", and "Occupations that have it all: Many openings, fast growth, and high wages".
The Harvard Business Review blog on Career Planning has interesting articles if you have a few years of work experience. Some of the blog posts cover topics related to job interviews, acquiring new skills without going back to school, and career decision.
BetterUp guide to career planning provides a great way to go about it. In a nutshell, they have these main sections:
The 7 steps to career planning can get you started in a heartbeat. If you are an employer, make sure to check cool ideas that will help your employees during their career planning journey. And don't forget, as mentioned in the article, "Career planning is the process of making decisions about what you want to do with your life and how you’ll accomplish it. It isn’t just a “one-and-done” activity, It should be an ongoing process that you revisit, especially when you, or the world, have changed."