1. When making annotations, you don't need to pursue the high aesthetic feeling of typesetting and handwriting, and you don't need to use colorful pens and gel pens. Annotation with erasable pen can avoid typos and omissions occupying vacant rooms and save space to the maximum extent.

2, color coding distinction. It also has a good effect to prepare more colors and replace shorthand symbols such as underscores with different colors.

3. We usually use the margins of book binding as annotations. When we have a chapter summary or a long feeling, it is also a good choice to use margin in the title page, preface and postscript.

4. When making annotations, you should learn to refine words and phrases, and use more words such as "good", "resource combination" and "concise, effective and unified" to ensure that every word you write is the essence.

It is also very effective to expand the limited writing space through post-it notes. Because of its characteristics, it will not affect reading too much, and it is very suitable for marking large paragraphs. However, we should pay attention to buying better quality post-it notes to avoid losing them. In this way, you can complete the notes in the book.