Go to coinmarketcap, type in bitcoin, and you can see for yourself how many forks there are. Most of these forks are complete garbage that serve no purpose, but somehow people buy it up. I think a couple days ago Bitcoin Candy forked from BCH or something... it's getting kinda ridiculous.
I understand that one did not need to have one's btc on an exchange in order to get the bch but it was easier.
How does one go about taking ownership of any of these other coins based on btc ownership at the time of that new coins creation and which are they?