[_ck_]

Well some are far easier than others.

First look for $wpdb and change to $bbdb

Then you have look at things like get_option and other functions and see if they can easily use the bb_get_option or other bb_ version of the function.

But even if the alternative function exists you have to be sure that it’s doing what you want. Things that relate to users are similar but things that relate to posts have to be change to topics and then there is comments vs posts.