You can work around pretty much any issue like this, but you shouldn't have to. A beginner's guide should define the concept.

I find this same issue with many things posted here. Even businesses marketing their product. My favourite is when they give you an abstraction salad instead of explaining something.

I clicked the first link so I got the gist but how many other people just give up and disengage with their post? Or click the link then just close the tab without reading further.

Although the fact that Google puts the Wikipedia BPF article in the sidebar might confuse you a little.