How do I make a thread where I can post about device?

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Like I made a bunch of recoveries and device trees about my device. Where can I post that?
As @AndyYan correctly said, just have a look at "Android Development and Hacking" and its sub-fora:
Bildschirmfoto vom 2021-05-07 08-17-15.png
For example like AndyYan stated Miscellaneous Android Development:
Or if you take Android General:
But maybe one of the other sub-fora suits you better. Your choice.

Have also a look into General Development with its differend fora (the above linked "Android Development and Hacking" is one of them):
 

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