As one of the old geezers, I check this board several times a day. I respond when I have something to add to the discussion at hand. That is not often as I'm not anywhere near an "expert", just a guy who likes Japanese swords and other sharp, pointy things. Most of the time I have little to contribute as my depth of knowledge is quite limited. I've been out of active collecting for some time. IMHO, there is only one basic rule to collecting anything:
Collect what you like, but like what you collect.
All else is made up categories for those who like to "specialize". I like all sorts of fine cutlery from Bronze age artifacts, 19th C "bowies", Swiss army knives, Finnish puukko and Japanese swords - just to mention a few and I've enjoyed it for over 60 years.
Rich S