# Lecture 09. Clean Coding
## New Lesson Posting Announcement
Hello, students! For this course, **175** new lessons (totaling 22 sections) are scheduled to be posted sequentially. Since I am producing multiple courses simultaneously, I am proceeding by posting **a little bit of each course alternately**, rather than uploading one entire course at once. Below are the posting principles and the posting schedule for each section of this course.
> For your reference, the lessons being posted now are not entirely new content, but are part of the process of creating **revised editions (2nd or 3rd editions)** that reinforce existing lectures.
## Posting Principles
- Currently, I am rotating through a total of 19 courses in order (circular method), posting one lesson per course alternately.
- Postings take place on weekdays (Mon-Fri), with 5 new lessons uploaded daily across all courses.
- For this course, the next lesson will be posted each time its turn in the rotation comes around.
- While the posting speed may feel slow compared to other courses, all courses are progressing together in the same manner.
## Posting Schedule by Section (Total 22 Sections)
| Section | Number of Lessons | Start Date | End Date |
|---|---|---|---|
| Section 1. The Beginning of Good Variables | 8 | 2026-07-02 | 2026-08-10 |
| Section 2. Function Design | 8 | 2026-08-14 | 2026-09-21 |
| Section 3. Modularization and Structure | 7 | 2026-09-25 | 2026-10-28 |
| Section 4. Deduplication & Abstraction | 8 | 2026-11-03 | 2026-12-09 |
| Section 5. Testing and Quality | 8 | 2026-12-15 | 2027-01-19 |
| Section 6. Comments and Documentation | 8 | 2027-01-25 | 2027-02-24 |
| Section 7. Collaboration and Code Review | 8 | 2027-03-01 | 2027-03-29 |
| Section 8. Exception Handling and Error Response | 8 | 2027-03-31 | 2027-04-28 |
| Section 9. Tool Utilization and Automation | 8 | 2027-05-03 | 2027-05-28 |
| Section 10. Naming Conventions and Domain Language | 8 | 2027-06-02 | 2027-06-28 |
| Section 12. Refactoring in Practice | 8 | 2027-07-01 | 2027-07-26 |
| Section 13. Code Smell Detection | 8 | 2027-07-29 | 2027-08-19 |
| Section 14. Security and User Considerations | 8 | 2027-08-23 | 2027-09-10 |
| Section 15. Code Disclosure and Open Source Etiquette | 8 | 2027-09-14 | 2027-10-04 |
| Section 16. What is Good Code? | 8 | 2027-10-06 | 2027-10-26 |
| Section 17. [Advanced] Performance Improvement and Optimization | 8 | 2027-10-28 | 2027-11-17 |
| Section 18. [Advanced] Debugging and Problem Solving | 8 | 2027-11-19 | 2027-12-08 |
| Section 19. [Advanced] Design Patterns and Principles | 8 | 2027-12-10 | 2027-12-28 |
| Section 20. [Advanced] Latest Technologies and Tech Trends | 8 | 2027-12-30 | 2028-01-14 |
| Section 21. [Advanced] Improving Existing Code | 8 | 2028-01-18 | 2028-02-02 |
| Section 22. [Advanced] Maintenance-Friendly Code | 8 | 2028-02-03 | 2028-02-21 |
| Section 23. [Advanced] Integrating Various Languages and Technologies | 8 | 2028-02-22 | 2028-03-08 |
## Estimated Completion
Based on the current pace, the estimated completion time for all postings of this course is **around March 2028**. (The actual schedule may be moved forward or delayed depending on production progress.)
