It depends. For football or something where I have time to plan ahead, then yes I'll check the form, weather, history of teams against each other, and so on. For something like the dogs where there are a lot of fast races in quick succession and it is more fun than making money, then it is down to a quick check on the dogs' details, any notes at the betting office and place the bets. The amount of research may vary but I don't like betting with no info at all.