Sex - a socially constructed medical categorization in which distinctions are made based on specific physical and biological characteristics.
Gender - socially constructed categorization related to intersections of identity, expression and social expectations and roles
Sexism - system of judgements, beliefs, actions, norms, policies, and practices that privilege the gender binary and place cis men in dominant, privileged position within the binary
Cissexism - sexism that maintains the assumptions of the binary by privileging those who "fit" in the constructed binary and targeting those that don't
Gender Identity - personal knowledge of one's own gender; exists on a spectrum
Gender affirming care aims to treat dysphoria by helping trans people align their bodies with who they truly are, as best fits their unique sense of self and transition goals.