Those who'll say that they know the trick would be lying to you and trying to scam you. You can gamble, but don't expect to win over time. You'll have both wins and losses, but you're way more likely to lose in the long run than to win. As for a website, it depends on the games you intend to play. But make sure it's a reputable website, such as Sportsbet.io, Fortunejack, Bustabit, Stake or something on their level. If you play skill based games, there's a chance you'll get good at it and start winning, but it's dim and a job is more secure for earning money than gambling.