Leftism is about being egalitarian. Everyone is equal, power is shared equally, and that equality is protected. There many very different paths and approaches to this conceptually. @stembolts@programming.dev gave a great overview of some basic specific policies below.

Rightism is about consolidation of power. Since power and wealth are inextricably linked (two sides of the same coin, as it were), the defining feature of Rightism is hoarding of wealth and entrenchment of power.

Looking at our two major parties, their platforms, their policies, and their behavior as organizations, it’s easy to tell that neither meets the definition of Leftist.