Maybe, it would be best to start with games you are familiar with in order for you to have an inital idea of how that game works. If you would jump to a game in which you are having no familiarity with, you would basically start from a scratch. But in terms of the safest games, there's really no such thing. All gaames has risk since it is gambling we are talking about. Sportsbetting I think is a game wherein winning is quite predictablr especially if you are familiar with the sports and the teams or players. Popularity could also be a good determinant on which one to bet your money with.
For me it is card games, I am very familiar with card games especially with poker.
But it all depends on every gambler since the criteria for choosing the safest online gambling is what game you are comfortable with and familiar with.
But still, being comfortable with a game does not make it safe to gamble. Gambling is "gambling" no matter how we look at it.