I'm one of those old farts at the leading edge of the Baby Boomers (b. 1945) who knows a little about a lot but not a whole lot about anything in particular.
I try to fill holes by initiating articles dealing things with about which I know a little or where I think doing the research would be interesting to me.
I read articles by others and, where I feel they've left significant questions unanswered, I research the answer and add the information to the article. This includes adding links to articles by others in Wikipedia.
I fix glaring spelin and gramer faux pas when efer I spot them n hav the time. Ths dn't mean to say I don't make them mice elf. I do. I only hope some1 else katches em whn eye dn't.