If you are looking for a beginners slot games, I will recommend Blackjack, Roulette, dice, video poker, Slots, baccarat, crash and plinko. I have played Roulette, crash, plink and dice and I can say it's a game you can make some profit with. For the other games, I have not but it have been recommended by someone before now. Stake.com offers a handle full of these games.
actually OP is clear mate about asking "SLOT GAME PROVIDER" in which maybe a help for newbie but I believe that being a newbie we need not to find a provider instead a better site to play and what game we will find the luck.
When I was newbie as slot player, I tried few providers such as betsoft, gameart, playngo, pragmatic and some others. At that time, the minimum bet for those games was at least $0.1 but now if we refer to Pragmatic, we can play as low as $0.013 per spin but it is not available in all casinos. So because of this reason, I think Pragmatic and combined with casino where it is allowed to bet that small, it can be the best provider for newbies.
I use to love pragmatic and Betsoft but nowadays ? i stop since now I am enjoying sportsbetting .