Thanks for starting this interesting topic,
@Liaminvestor!
How did you got into domains?
I had used domain names in a small home-based business, and a local travel site, and from that got interested in some other domain names.
when?
In terms of domain names as something to be bought and sold, only in 2016.
Your First domain registerd?
I still have the one for our now closed home business, which was my first registration in 2001. Chignecto.ca it is the name of a bay that is part of the Bay of Fundy, home of the highest tides in the world. I liked the sound of the name, and it is distinctive and known in the region, both important for the business. I have domain names going back to 1996, but not that I registered.
Your first sale?
The first number of months I exclusively bought and sold on Namecheap and their marketplace. I actually had a few dozen sales, but all for tiny turn arounds, buy at $1 sell for $10 to $25. I mainly then registered new gTLDs and .co. I think the very first was a tiny sale of MeteorTech.co. I have had a deep interest in things meteor, and liked the combination. Fun fact: at time I am writing this it is unregistered again. I am not recommending you register it. While buy at $2 sell at $20 (back then) is NOT a strategy long term, the many sales over a short period helped me fund the early days and helped me learn which names had a market. I don't take that approach any more.
Your Favorite domains?
There are so many. My favourite changes from month to month. I think to have better trust in AI we need to focus on using multiple AI that have been independently trained to have more confident results. I like my Multipath.ai a lot. I also like Manufacture.one for a one-of prototyping/3D printing/ etc. service. Canadian.homes is another favourite. There are so many....
Trends? markets?
Partly to inform my writing at NamePros, I try to be very diversified, investing in many different extensions, sectors and types of names. This is not a good strategy for investing success, where sharper focus is probably better.
interesting sales?
I find any sale interesting!

Seriously though, it is hard to pick one. But I like names that get promptly used in a meaningful way. A few years ago I sold rebound.cc. I like the term a lot, and was so happy to see it in use for a free global event where people anywhere can register and do their own gravel surface cycling event. Each year they have hundreds of thousands of riders, from all over the world, covering a total of millions of km. This year's event is May 30, if anyone reading this is a gravel cycling fan. Why not sign up? Yes there are prizes. And did I say free?
Interesting Negotiation?
I hardly ever do more negotiation than a few simple back and forth via a marketplace re offer and price. Sorry but nothing interesting to contribute.
A domain getting good offers, and still refusing?
I wish I had many to report. I have the name Watt.cc, that I like a lot in our increasingly electrified world, and also a LN and used in many businesses. I have had quite a few offers on a few different marketplaces, but still holding the name. I'm not looking for a lot, but plan to hold out for the order of my BIN.
Vision?
My vision is definitely getting worse, even with my glasses — thanks for asking. Oh, that is not what you mean!

That is a big topic. I see a future for domain name use in marketing campaigns, not just as the main website. I like clever phrases for this. We will see.
Strategy?
Have more discipline. Try to focus only on names that would place in your top quarter of entire portfolio to gradually improve quality. Have fewer domain names. Easy to write about. Hard to achieve.
Thanks again for the topic! Best wishes to all.
-Bob