First edit (July 2006): Newark Light Rail. Was it on July 25, 2006? The dates on Wikipedia are in UTC, so my first edit was actually on July 24 local time.
First page creation (July 2006): Military Ocean Terminal at Bayonne. It was just a follow up on my first edit. I read an article about Bayonne getting the old Newark City Subway cars to use in their development project. So I wrote something about it. Unfortunately, after more than 6 years, those subway cars haven't made to Bayonne's operation yet. Not a good start for the first page, right?
First sandbox (May 2009): Need I say more? By 2009, I realized that I edited more and more pages. I just needed a space to test out my new pages.
First mass edit (December 2009): Atlantic City School District. Adding Indicator 13 to the great work about school spending done by Alansohn (talk). Then I spent a great deal of time on the Christmas day editing hundreds of NJ school district pages manually to add that indicator from the source. Still, I spent more time in writing English than just coding a bot to do this job.
First SVG file on wiki (November 2012): Image:Higher speed loco ca us.svg. You can see that it was the starting point of my new obsession about trains.
First WikiLove (February 2013): Someone just gave me a WikiLove message. It was a cheeseburger right after I created the Medicine chest (idiom) page. Thanks for that juicy burger, but hey, I needed to go get Tums from my medicine chest right after I ate that thing.
First user page of my own (March 28, 2013): Finally, after more than 6 years of creating and editing other pages. It's now time for my own!
First barnstar (May 2013): I got the Tireless Contributor Barnstar for "authorship of interesting articles like the Westinghouse Lamp Plant page". I came across an interesting story of how they refined uranium in a site in New Jersey to be used for the first reaction in Chicago. So, I spent time digging through old documents and created that page. It was nice to know someone else appreciated it. Thank you for that.
First 1,000 unique page edits (October 2013): The 1,000th unique page that I edited was Wind turbine design to add a photo taken when we visited Wolfe Island Wind Farm in 2012. I had been adding photos (extracting from public domain documents or using my own) to articles lately in a hope to help those visual learners out there.
Edison batteries
First known use on TV (September 2014): I don't know how many times my contributions have been used on TV, so I can't really say which one was the first. The first one that I know of was on the H2's 10 Things You Don't Know About episode about Edison and Tesla. My picture (right) of Edison batteries was used there (at 21:30), but too bad they didn't give the credit at the end of the program. After all, we are not very good at educating TV procedures of what Creative Commons licensing is all about.
First Good Article (November 2014): A bit of work needed on Higher-speed rail, and finally it was promoted to GA.
First Media of the Day (December 2022): My video of Yolanda, a delivery robot, was featured on Wikimedia Commons main page as Media of the Day on December 10, 2022.
Mostly something about New Jersey in my early years
In late 2012, I started editing many train-related articles.
In 2013, I started creating and editing articles related to electricity generation.
In 2013, I also started uploading more and more images to Wikimedia Commons to include in several Wikipedia articles. See the list of my uploaded files here. I don't just dump my hard drive to Commons. I only upload the media that can be used in Wikipedia articles.
After that point, most articles that I created or edited were driven by photos that I took of interesting things that I happened to come across.
Below are some examples of the articles that I created and contributed a significant portion of the contents:
