Sonic games.

Start with the original if you can.

I play that Sonic on SEGA when I was a child
I cant say Is the best sonic game, but for sure you Will know how Sonic games are.

Sonic 1, 2, 3, Sonic & Knuckles, Sonic 3D Blast, Sonic CD, Sonic Advance series, Sonic Adventure 1 and 2. Can't really go wrong with those.

Sonic 2006 and Sonic Boom are universally described as awful, avoid those.

The rest vary in quality a bit. People enjoy complaining about Sonic games for whatever reason. Keep that in mind when reading user reviews.

my fav 3 sonic games would have to be sonic heroes, sonic riders, and sonic adventure 2

If you're gonna go for the classic trilogy, I read that the android ports of those games have exclusive content (e.g. Sonic 2 for Android has a completed Hidden Palace Zone), so go for those versions if you can.

Sonic CD is a bit of a weird side game with mechanics that never got used again in the series despite technically being part of the mainline games. I'd suggest starting with a more traditional classic game like Sonic 2 or Sonic 3 & Knuckles.
About the 3D games available on Steam, probably Sonic Adventure DX or Sonic Generations, Generations is really good. Sonic Lost World is another odd one with mechanics not used in other titles and fans have conflicting feelings about it, I personally like it tho. Sonic Adventure 2 on the other hand is a frustrating experience at least for me, having a third of a game be good doesn't excuse the rest of it being awful, specially when you're forced to play through the bad levels to get to the good ones.
Also you must play Sonic & All Stars Racing Transformed at some point of you like arcade racing games.

Sonic Boom: Rise of Lyric oh boi the best of the best cuz it's the best

Try Sonic Mania .

My favourites.

2D, Sonic 2 and Sonic Mania.
3D, Sonic Adventure 2 and Sonic Heroes.

Go through all of them from the first game to the most recent, it's more fun that way. Also, play the fan made games Before the Sequel and After the Sequel.

If you're talking about on Steam, Mania & Generations are both great choices. I'd go with Mania first, personally.

The only one I can personally vouch for to recommend since I've beaten it is Generations, but I'd say listen to others and play Mania as well.

Kinda surprised not to see more love for some of the more modern titles like Generations and Mania. Both of those have been very well received and would be a great starting point for someone new to the series.

Anyways, since most of the big hits have already been mentioned up to this point, throwing a slight curveball into the discussion. I find it amusing that the whole "gotta go fast" thing doesn't really apply to the games. It's more about maintaining momentum rather than going as fast as you can. In fact, there's plenty of levels where going too fast will get you killed on an obstacle you didn't have time to react to. Anyways, that's just my two cents. Hope you find one you really like!

Thanks for the responds, and yeah i think i gonna though first via original trilogy. So probably from Sonic toward Sonic 3 & Knuckles.

I quite never got the appeal of the Sonic games. You mostly run at high speed and bump into enemies, losing your rings all the time if you don't know the levels. I mean, collecting the chaos emeralds and turning into that blonde hedgehog was kinda cool, but nothing too special. But I respect the nostalgia many people might have.

I would suggest going through the story of the original trilogy, then doing mania before going to modern games like Generations. People say Adventure games are good, but i didn't like them when i played them :/
Skip the Lost Worlds, it's a Mario game. IF you like spinoffs, try Spinball or Mean Bean machine.

As a kid I played Sonic Adventure 2 but none of the others. Recently I beat all the Sonic games on PC and I thought Sonic Mania was the best 2D one (maybe the best overall but that's a harder decision)

Thanks folks, i decieded to get now on sales Sonic Games and got them. Only expect is Sonic Mania, because not enough $$$. But maybe next time.