Difference

Doujinshi is amateur manga publications, featuring either a cast of original characters and plot or characters from another manga or an anime (a 'fan manga)

Yaoi is used to describe titles that contain sex scenes and other sexually explicit themes

I would just like to clarify that a doujinshi is not limited to amateur manga publications. Doujinshis are "self-published", yes, but they are not limited to amateur manga publications. Professionals can produce their own doujinshis as well for the following reasons:

1. FANART OF PREEXISTING INTELLECTUAL PROPERTIES

2. ECCHI MATERIAL

3. One-shots

4. LEGAL REASONS/MATTERS

well most of the doujinshis we see are a combination of 1, 2, and 3, so i dont have to expound on them lmao.

As for the 4th one, an example for this is https://imgur.com/a/GhFXxGr. this is a doujinshi created by the original author herself. However, yaoi is basically considered illegal in chxna OR any works that depict a sexual relationship between men. Therefore, the author can only self-publish a doujinshi in order to "get away" with it.

ohhh thank you....

ahhhh ok i get it now thank you.... (●'◡'●)