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i don't get shares... i tried sharing your share with my answer, but i now shared the original one?

Anyways, i would pick touhou 7: perfect cherry blossom as a starting point

i will go "against the grain", and suggest either Impossible Spell Card (14.3) or Violet Detector (16.5), since they are level-based, so you don't have to worry about lives or continues, etc., and can concentrate on learning the patterns. i've also had just more fun with these than with the mainline ones ('tho i haven't played that much touhou games overall).

They all have a little something to offer, but I made a chost on exactly this topic (I recommended 7, 16 or 8) a little while back! If there's one on there that sounds interesting to you, I highly recommend giving it a try ^^

Almost every mainline windows Touhou game is essentially the same simple bullet hell with some mechanical twists. Like, maybe one will have a special mechanic where u get a shield if u collect enough Items or one will give u extra lives based on shooting down special targets; there's even one that's a roguelike! (There's also a lot of side games, and the games he made for pc-98; but the side games are a terrible place to start as they're spin offs and the pc 98 games are noncanon, really weird, and require emulation)

If you want to play them All in Order: 6 (scarlet devil) is the first one with basically no weird twists, but it lacks some basic Quality of Life features that make it very hard to play. 7 (perfect cherry blossom) has those features and is a little easier then most, due to its feature being "get an invincibility shield sometimes".

For 10 (mountain of faith) he used a new engine and thus the games play a bit smoother, this one is hard but doesn't have many weird twists ans the character roster is recognizably simple (and very fun).

For 15, the twist was "instead of playing Arcade Style with lives and continues, you play Celeste style where each segment is its own mini challenge and you start over each time". Great for people who really like practicing over and over to get good without doing the whole game.

For 18 he made a roguelike. This one isn't a great place to start as it's wildly complex and weird unless you, like me, absolutely adore roguelikes.

Those are the main recommendations; I'd say it really depends on what you wanna do. If you wanna Get Deep Into Touhou and Play Every Game: start at 7, try it out, then maybe go back and try 6 (with the hitbox patch) and then work your way up through all of them. If you want to See What Touhou Is Like, give 10 a shot. If you are a SHMUP fan and really like to try hard challenges, go for 15. If you're the exact kind of pervert I am... Well you probably still shouldn't start with 18 but you'll enjoy it when you get there.