@Sterophonick As I understand it: to learn to recognize internal thought patterns and views that are informed by colonialist perspectives (on a wide variety of topics, including but not limited to stuff like 'growth', 'civilization', 'intelligence', etc.), and to work on getting rid of those and stepping back from the colonialist perspective, instead learning to view these things from the perspective of the colonized and oppressed.
Which is necessarily going to be a lot of work, there's no three-step plan.
@Sterophonick After thinking a bit more (because I realized that still described the vague shape of an owl at best), a practical way to go about this, is to just very frequently ask yourself "... why do I actually believe this?" and if the answer is something like "research" or "everybody knows that", follow it up with trying to work out where the idea originally comes from and what its purpose was, even for the things that seem obvious.
An example case would be "IQ" and its treatment as a legitimate metric - where does the metric come from, what was it invented to do?