One strategy to increase your odds at Bingo is to play as many cards at one time as you can. The key phrase in that statement is "as you can", because it hurts your odds to play more cards than you can keep up with.
Still, the more cards you are dabbing with your Bingo dabber at one time, the more chances you have of winning a Bingo. Thus it stands to reason that the most frequent Bingo winner would be the person who can work the most cards at one time.
Playing as many cards as you can works well offline, though in online casinos you might find that you might not be able to play as many cards as you want. In some cases, both real and online casinos will simply make the rule that everyone must play the same number of cards at every game. This makes it more difficult for one player to have an advantage over others.
In the case of the online Bingo game, this gives the house a real edge over a mass group of players. This practice is also common in churches, which do not like the idea of one player winning because they had more money than the other players to invest in buying a lot of cards at once.
Still, if you can get a virtual monopoly by playing a large number of cards at once - some people play as many as twenty in one game - then do it as it greatly increases your chances of winning.
Joining a forum to share tips is also a good idea, or joining the community at an online site.