This really should be two posts, each called “So what is xxxxx anyway?”, but I sort of promised to do it in one.
First, intersectional feminism:
Intersectional feminism, also known as Intersectionality, is a branch of feminism asserting that all aspects of social and political identities (gender, race, class, sexuality, disability, etc.) discrimination overlap (or "intersect"). Intersectional feminism separates itself from “white feminism” (as it views traditional feminism) by acknowledging the fact that all women have different experiences and identities. The term was coined by black feminist scholar Kimberlé Williams Crenshaw in 1989. It defines intersectionality as “the complex, cumulative manner in which the effects of different forms of discrimination combine, overlap, or intersect”.
Second, transfeminism:
Transfeminism is "a movement by and for trans women who view their liberation to be intrinsically linked to the liberation of all women and beyond.", as defined by scholar and activist Emi Koyama. It supports the belief that the rights of transgender women are linked to the feminist movement, specifically the right to assume a gender identity that does not correspond to one’s biological sex assigned at birth. See https://eminism.org/readings/pdf-rdg/tfmanifesto.pdf.