First things first: no, this is not a comprehensive list of knife tip geometries! There are so many of them - and most of them so highly specialized - that, if you need one of them, you
know... XD So, in order to give a "beginner-friendly" overview, I've narrowed it down to four types that are common enough you may actually encounter them in real life without having to look for them in a specialized store.

Let's look at these in some detail! (With the caveat that, of course, tip geometry is
not the only thing that determines a knife's overall function. Material matters. Blade thickness matters. Grind matters. Handle design matters. Size matters. XD And so on. Really, this can only serve as a rule-of-thumb - but we have to start
somewhere when trying to determine what a knife is for, right?)
( Explanations of these four knife tips. )Anyway... This (grossly over-simplified, I know) entry will hopefully help you identify what kind of blade you are dealing with, what its strengths and weaknesses are, and what tasks people will likely use it for. (None of this is intended as legal or professional advice; don't sue me, yadda, yadda. If you do dangerous shit with sharp objects, I'm
not responsible.)