To get free bonuses and rewards on Stake, you can sign up using a specific code, such as 'fencer GG'. By playing under this code, you'll earn high rewards based on your gameplay in the form of a wager leaderboard. Additionally, there are exclusive slot challenges and other promotions that can provide bonuses and rewards. Joining the associated Discord channel can also keep you updated on how to earn more bonuses like $1 a day for life or a free $25.