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Games like slot machines are usually the easiest ones and the most uncomplicated ones so it’s best suitable for beginners. It gives you a feel of the casino and gambling in general. If you’re a fan of sports, you can go ahead and bet on sports as well. Though it may not that easy for a beginner to do.
If he has a favorite sport which he follows up by watching the match or updates, he can easily bet on that sport. If he doesn't, he shouldn't think of sportbet but should go for casino games like slot which is 100% pure luck. Since he is new, he can start with the demo in order for him to understand how the game works before betting with real cash.
Yes. For the sake that he's a newbie, I will encourage him to start with sports betting if he's already a soccer fan but to take it slowly. He can begin by betting on the games he's more sure of than the ones he's less sure of. He can start gambling on games that feature bigger clubs to play against smaller ones having in mind that one will win and the opponent will lose.
While I will not want to easily encourage him to just go into slots games though they seem to be simpler than the sports bets is that gambling on slots games is purely a matter of luck and no much or any brainstorming or strategy needed. If he starts with that and gets used to 100% luck games, he will also assume that all form of gambling is 100% based on Luck's which is not entirely true.