Dear readers, hello! While studying this field, I often struggle with the lack of comprehensive, accessible explanations that are easy for me to understand. The available resources are often obscure, and online codes and images are scattered. To address this issue, I have decided to compile the information I find and record my insights, organizing them into these blogs according to my own logic. With the hope that these blogs can help beginners, I have chosen to publish them on my personal blog space. I am very grateful that you have patiently read through my articles. Thank you!