Compare several sites before committing to one — Just like anything, it is best to try a few websites before committing to just one of that, even when it is just slot machine online.
Do a search at any online search engine and look at the first few sites that appear. Compare the games they offer, the way they allow you to play, and if you need to sign up for an account or not. Test out the ones you like the look of the best.
Play several of the games on slot machine online sites — Do not just stick to one game. Each slot machine online site has many games you can play. Choose a variety and test all of them out. Play the ones longer that you like the most, and make a note of them for the next time you arrive on the site.
Play the game you like the most in depth — If there is one game that stands out, play that game more than any others. That is because, if you want to eventually move to the paid version of the game, you will know how to play it and have more of a chance of winning.
Going from free to paid — Each site offers a free way to play slot machine online and a paid way. Play the free way first and then move to paid later, if you like to gamble.