Cannot choose custom categories for custom post type in post editor

You have to make your taxonomy visible in rest – otherwise it won’t be visible in Block Editor (Gutenberg).

There is show_in_rest arg for register_taxonomy. It’s default value is false, so you have to set it to true.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)