I've learned... tons. Just lots and lots, but not really sticking with any of them.
First was what was then being called 'Kenpo Karate' at about 6-8 years old... had a hiatus until I got back into martial arts (and firearms at the same time
) at age 12 or so. Started taking Judo, and a heavily Karate-biased 'freeform combat' then... dropped judo in exchange for the Iaido (sword) class they also had at that hour in the dojo... eventually had to change to a different dojo because I moved to the other side of town... so then went to Krav Maga (which also comprehensively covered knife and machete fighting) and kickboxing (the instructor was teaching Thai-style, not American-style!).
Went to Taiwan then, and started Liu He Ba Fa, eventually decided to drop (with the suggestion from the instructor). Switched to Xing Yi Quan, stuck with that until I came back from Taiwan.
Started Jeet Kune Do here again, along with picking up Iaido once more.
I'm going back to Taiwan mid-summer, and probably going to either pick Xing Yi Quan back up, or go to Ba Gua Zhang.