Maintaining a notebook can be very important, depending on the context. Here are a few reasons why it might be beneficial:
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Organization: A notebook helps keep information organized, whether it's for work, study, or personal projects. You can track ideas, tasks, and progress in a structured way. 
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Record Keeping: It serves as a record of your thoughts, decisions, and actions. This can be helpful for reviewing what you've done, understanding your thought process, and making improvements. 
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Learning and Reflection: Writing things down can reinforce learning and provide a space for reflection. Reviewing your notes can help you better understand and retain information. 
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Creativity and Problem Solving: Notebooks can be a space to brainstorm, sketch out ideas, and solve problems. Writing or drawing can sometimes make it easier to work through complex issues. 
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Accountability and Motivation: Seeing your plans and progress written down can help keep you accountable and motivated to achieve your goals. 
Whether it's a physical notebook or a digital one, maintaining a record can be a valuable habit. However, the importance of keeping a notebook also depends on your personal preferences and needs. Some people find digital tools more efficient, while others prefer the tactile experience of writing on paper.