Any kind of information or ability can be considered knowledge regardless of its usefulness.
The most valuable type of knowledge is that obtained through the scientific method and is to be considered true until proven false.
The research for knowledge should not be impaired by societal norms or traditions that are not supported by proven facts.
Because humans are fallible, one should always question themself and others and never believe anything that cannot be proven or is not evident.
Errors are at the core of the process of learning and should therefore be treated as opportunities for growth.