Update teaching.md with experience details

_pages/teaching.md

@@ -1,12 +1,17 @@
 ---
 layout: page
 permalink: /teaching/
-title: Teaching
-description: Materials for courses you taught. Replace this text with your description.
+title: Experience
+description: Teaching, service, outreach, and other experiences.
 nav: true
 nav_order: 5
 ---
 
-For now, this page is assumed to be a static description of your courses. You can convert it to a collection similar to `_projects/` so that you can have a dedicated page for each course.
+## Teaching
+I have been a teaching assistant for the following courses at Peking University:
+- 2023 Fall: Galactic Physics (Prof. Fangzhou Jiang)
+  - Give a lecture on the topic of "Understanding the formation and evolution of galaxies through their SEDs"
 
-Organize your courses by years, topics, or universities, however you like!
+## Service
+- 2023 - 2024: Co-organizer of the KIAA-PKU Galaxy Journal Club
+- 2023 Summer: Volunteer of the 2023 CSST Summer School