My favourite markets to have a gamble with online bookmakers, as opposed to using Bookies at the track are Australian greyhound and horse racing, AFL football, NRL rugby, cricket, major title fight boxing in most weight divisions, major sanctioned Mixed Martial Arts and UFC title fights, major tennis & golf tournaments, NBL and NBA basketball, come to think of it, basically anything that I can bet on, and more importantly, consistently win on.
I'm interested in learning more about betting on e-sports and other emerging betting markets. I find that there is often great opportunities in new betting markets.