Hi, I would like to make discourse open the first post always instead of the last read post, is that possible?
No, this is not possible. You can do this if you open links in anonymous mode in the browser, or if you never log in.
Just to clarify, you can enter a topic at the top by clicking or tapping on the number of replies.
Clicking or tapping on…
the topic title → enters at last read position
the number of replies → pops up a date selector so you can enter at top or bottom.
the last reply date → enters at the bottom
Auto-focus on post while opening