Wikipedia’s article puts it pretty well. It’s poorly defined, partially because of the history of how the alt-right defines itself and partially because it has been improperly used on other far right groups. The best you can get is a white identity ground that despises liberal multiculturalism, but it’s more complex than that.

And while we’re at it, what’s ‘neo’ about neoliberals? And what’s ‘anarcho’ about anarchocapitalists?

It’s all bullshit to make it seem like the very few people who have all the power is somehow shifting when it really isn’t.

Imo the only difference from regular conservatism is the way it’s branded. The alt right takes conservative politics and puts a revolutionary spin on them.