Oh! Thanks everyone who mentioned me 
I’m flattered.
I discovered Coda by accident. I was procrastinating on Product Hunt when Coda announced a contest there. A person who’d build the coolest doc would win a MacBook Air.
I didn’t win the laptop but I won something more — a niche for me to work in. Soon I became one of the first (if not the first) consultants on Coda building docs for hire and sharing useful tips in the Community. Needless to say, with the money I made I ultimately bought a laptop (and a better one, lol.)
These days I’m not as active as I used to be and I’m not as excited about client work either — all things wear out and I’ve got a life to live. Besides, the Coda consulting market has been maturing since, giving us new blood like @Scott_Collier-Weir, @Connor_McCormick1, @Christiaan_Huizer, and many more to come soon and take over 
So lately I decided to return to the thing I was passionate about all my life: teaching. That’s how I made a name for myself in here, by teaching others how to use Coda to the fullest. And that’s what I’m going to do even better with my upcoming Coda Courses, which I’ve been Maker Funded to build.
Now, onto some answers:
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First experience: actually I was confused at first (even I!) But then I looked through some templates and most importantly browsed through the community. And suddenly it got all clear.
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First post in the community: fishing for upvotes for the MacBook Air contest with this
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First doc ever: the third reincarnation of a motivation technique I had come up with back in 2012. Actually the 4th reincarnation is in the backlog for some Patreon Specials
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Who made an impression on me: the whole community as a collective. But if I had to name one person in particular that’s @Phil_Hamilton and his crazy doc experiments. It’s probably Phil whose progress bar tricks I saw in the Community when I first joined. That opened my eyes at the moment, motivating to find more tricks and creative uses, which ultimately led me to where I am now.