Favorite examples of a priori knowledge.
Similarity. The simple act of recognizing 2 things that look alike as being similar. Without it babies couldn't learn to identify their parents. They can't learn anything at all because every time they open their eyes it would be a new flood of sensory information unconnected to any other. Bizarre thought.
Continuity in time. That the object that you are seeing is the same one you were looking at a milisecond ago. This transfers to general continuity of existence issues which development specialists argue over whether they are learned or inherent. If Dad walks out of the room does, he still exist questions. But you have to have continuity of direct perception before you can learn anything else.
Flip side of similarity is distinction. This object is dissimilar from that one. Otherwise sensory information is just that. A meaningless picture.
Sense of self. You have to have some notion that you exist as a separate entity in the universe. You learn what is which through experience(ever watch a baby discover their hands? Very cool) but the basic concept is there to begin with.
Some people argue that this is not true knowledge. That it's the hardware and knowledge is the software. Using the computer analogy I view this stuff as the operating system. But the point is that these are concepts and without them you can't make any sense of sensory input. Even if you don't know what a person is you have to see a pinkish blob that moves while the rest of the room doesn't to learn what a person is. Identifying movement can't be done without recognizing continuity in time. Identifying pinkish blob can't happen if each time you see it it doesn't look like the previous pinkish blob. And seeing it as separate from the room can't occur without the notion that things can be separate. It sounds like circular reasoning because the concepts are so basic but mull it over with the idea of transitioning from general abstracts to specific situations.
Epistomology, it may be worthless but it sure is cool. That was our college motto in a naturalism and skepticism class.
Philosophy students, we forget more worthless crap than you'll ever learn. That was the department motto. That's why I became an econ major. Then I realized all college departments have basically the same motto and decided to stick with econ anyway.
Most fights start standing up. Keep it there.-standup school
Most fights end up on the ground. Take it there.-ground school
Fights start where they start and go where they go. Go or take it whereever works best.-MMA