How to lead self career?

Recently I've read an article with some useful career tips:

• Do not start to many things. Focus on a reasonable amount.
• Share your knowledge and responsibilities, so that you have time to learn new things.
• Think how to capitalize your knowledge, activities. Make a plan. Maybe you will profit from it in a few years' time.
• Specialize in areas that will make you a more valuable employee.
• Prepare a long-term strategy for your career and revise it regularly.